Organic compounds that have a relatively high VAPOR PRESSURE at room temperature.
A phase transition from liquid state to gas state, which is affected by Raoult's law. It can be accomplished by fractional distillation.
A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.
The contamination of indoor air.
A solventless sample preparation method, invented in 1989, that uses a fused silica fiber which is coated with a stationary phase. It is used for sample cleanup before using other analytical methods.
A microanalytical technique combining mass spectrometry and gas chromatography for the qualitative as well as quantitative determinations of compounds.
Any tests done on exhaled air.
The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.
The act of BREATHING out.
Five-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives.
Toxic, volatile, flammable liquid hydrocarbon byproduct of coal distillation. It is used as an industrial solvent in paints, varnishes, lacquer thinners, gasoline, etc. Benzene causes central nervous system damage acutely and bone marrow damage chronically and is carcinogenic. It was formerly used as parasiticide.
Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or material. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.
A widely used industrial solvent.
A family of isomeric, colorless aromatic hydrocarbon liquids, that contain the general formula C6H4(CH3)2. They are produced by the destructive distillation of coal or by the catalytic reforming of petroleum naphthenic fractions. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.
An order of ascomycetous FUNGI which includes many economically important plant parasites as well as saprophytes.
The generic name for the group of aliphatic hydrocarbons Cn-H2n+2. They are denoted by the suffix -ane. (Grant & Hackh's Chemical Dictionary, 5th ed)
A chlorinated hydrocarbon used as an industrial solvent and cooling liquid in electrical transformers. It is a potential carcinogen.
The act of feeding on plants by animals.
The five-carbon building blocks of TERPENES that derive from MEVALONIC ACID or deoxyxylulose phosphate.
A device used to detect airborne odors, gases, flavors, volatile substances or vapors.
Air pollutants found in the work area. They are usually produced by the specific nature of the occupation.
Compounds with a core of 10 carbons generally formed via the mevalonate pathway from the combination of 3,3-dimethylallyl pyrophosphate and isopentenyl pyrophosphate. They are cyclized and oxidized in a variety of ways. Due to the low molecular weight many of them exist in the form of essential oils (OILS, VOLATILE).
The gaseous envelope surrounding a planet or similar body. (From Random House Unabridged Dictionary, 2d ed)
Pyrolysis of organic compounds at the temperature of a hydrogen-air flame to produce ionic intermediates which can be collected and the resulting ion current measured by gas chromatography.
The exposure to potentially harmful chemical, physical, or biological agents in the environment or to environmental factors that may include ionizing radiation, pathogenic organisms, or toxic chemicals.
The volatile portions of substances perceptible by the sense of smell. (Grant & Hackh's Chemical Dictionary, 5th ed)
The extraction and recovery of usable or valuable material from scrap or other discarded materials. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed.)
Supplying a building or house, their rooms and corridors, with fresh air. The controlling of the environment thus may be in public or domestic sites and in medical or non-medical locales. (From Dorland, 28th ed)
The surface of a structure upon which one stands or walks.
A plant family of the order Malvales, subclass Dilleniidae, class Magnoliopsida of tropical trees.
Alkyl compounds containing a hydroxyl group. They are classified according to relation of the carbon atom: primary alcohols, R-CH2OH; secondary alcohols, R2-CHOH; tertiary alcohols, R3-COH. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Organic compounds containing carbon and hydrogen in the form of an unsaturated, usually hexagonal ring structure. The compounds can be single ring, or double, triple, or multiple fused rings.
The unstable triatomic form of oxygen, O3. It is a powerful oxidant that is produced for various chemical and industrial uses. Its production is also catalyzed in the ATMOSPHERE by ULTRAVIOLET RAY irradiation of oxygen or other ozone precursors such as VOLATILE ORGANIC COMPOUNDS and NITROGEN OXIDES. About 90% of the ozone in the atmosphere exists in the stratosphere (STRATOSPHERIC OZONE).
An endosymbiont that is either a bacterium or fungus living part of its life in a plant. Endophytes can benefit host plants by preventing pathogenic organisms from colonizing them.
A commonly used laboratory solvent. It was previously used as an anesthetic, but was banned from use in the U.S. due to its suspected carcinogenicity.
A compulsion to set fires.
The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.
Living facilities for humans.
Organic compounds containing a carbonyl group in the form -CHO.
Liquids that dissolve other substances (solutes), generally solids, without any change in chemical composition, as, water containing sugar. (Grant & Hackh's Chemical Dictionary, 5th ed)
Gases, fumes, vapors, and odors escaping from the cylinders of a gasoline or diesel internal-combustion engine. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Random House Unabridged Dictionary, 2d ed)
Worthless, damaged, defective, superfluous or effluent material from industrial operations.
Drugs that act locally on cutaneous or mucosal surfaces to produce inflammation; those that cause redness due to hyperemia are rubefacients; those that raise blisters are vesicants and those that penetrate sebaceous glands and cause abscesses are pustulants; tear gases and mustard gases are also irritants.
Methodologies used for the isolation, identification, detection, and quantitation of chemical substances.
Containers, packaging, and packaging materials for processed and raw foods and beverages. It includes packaging intended to be used for storage and also used for preparation of foods such as microwave food containers versus COOKING AND EATING UTENSILS. Packaging materials may be intended for food contact or designated non-contact, for example, shipping containers. FOOD LABELING is also available.
Eighteen-carbon cyclopentyl polyunsaturated fatty acids derived from ALPHA-LINOLENIC ACID via an oxidative pathway analogous to the EICOSANOIDS in animals. Biosynthesis is inhibited by SALICYLATES. A key member, jasmonic acid of PLANTS, plays a similar role to ARACHIDONIC ACID in animals.
A combustible, gaseous mixture of low-molecular weight PARAFFIN hydrocarbons, generated below the surface of the earth. It contains mostly METHANE and ETHANE with small amounts of PROPANE; BUTANES; and higher hydrocarbons, and sometimes NITROGEN; CARBON DIOXIDE; HYDROGEN SULFIDE; and HELIUM. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A colorless liquid used as a solvent and an antiseptic. It is one of the ketone bodies produced during ketoacidosis.
Salts and esters of hippuric acid.
Volative flammable fuel (liquid hydrocarbons) derived from crude petroleum by processes such as distillation reforming, polymerization, etc.
A highly reactive aldehyde gas formed by oxidation or incomplete combustion of hydrocarbons. In solution, it has a wide range of uses: in the manufacture of resins and textiles, as a disinfectant, and as a laboratory fixative or preservative. Formaldehyde solution (formalin) is considered a hazardous compound, and its vapor toxic. (From Reynolds, Martindale The Extra Pharmacopoeia, 30th ed, p717)
Four carbon unsaturated hydrocarbons containing two double bonds.
Elements, compounds, mixtures, or solutions that are considered severely harmful to human health and the environment. They include substances that are toxic, corrosive, flammable, or explosive.
A class of compounds composed of repeating 5-carbon units of HEMITERPENES.
Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.
A kingdom of eukaryotic, heterotrophic organisms that live parasitically as saprobes, including MUSHROOMS; YEASTS; smuts, molds, etc. They reproduce either sexually or asexually, and have life cycles that range from simple to complex. Filamentous fungi, commonly known as molds, refer to those that grow as multicellular colonies.
One of the three domains of life (the others being Eukarya and ARCHAEA), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by cell division, and exhibit three principal forms: round or coccal, rodlike or bacillary, and spiral or spirochetal. Bacteria can be classified by their response to OXYGEN: aerobic, anaerobic, or facultatively anaerobic; by the mode by which they obtain their energy: chemotrophy (via chemical reaction) or PHOTOTROPHY (via light reaction); for chemotrophs by their source of chemical energy: CHEMOLITHOTROPHY (from inorganic compounds) or chemoorganotrophy (from organic compounds); and by their source for CARBON; NITROGEN; etc.; HETEROTROPHY (from organic sources) or AUTOTROPHY (from CARBON DIOXIDE). They can also be classified by whether or not they stain (based on the structure of their CELL WALLS) with CRYSTAL VIOLET dye: gram-negative or gram-positive.
A group of alicyclic hydrocarbons with the general formula R-C5H9.
A colorless, toxic liquid with a strong aromatic odor. It is used to make rubbers, polymers and copolymers, and polystyrene plastics.
The presence of contaminants or pollutant substances in the air (AIR POLLUTANTS) that interfere with human health or welfare, or produce other harmful environmental effects. The substances may include GASES; PARTICULATE MATTER; or volatile ORGANIC CHEMICALS.
A phylum of fungi which have cross-walls or septa in the mycelium. The perfect state is characterized by the formation of a saclike cell (ascus) containing ascospores. Most pathogenic fungi with a known perfect state belong to this phylum.
Expanded structures, usually green, of vascular plants, characteristically consisting of a bladelike expansion attached to a stem, and functioning as the principal organ of photosynthesis and transpiration. (American Heritage Dictionary, 2d ed)
An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.
Multicellular, eukaryotic life forms of kingdom Plantae (sensu lato), comprising the VIRIDIPLANTAE; RHODOPHYTA; and GLAUCOPHYTA; all of which acquired chloroplasts by direct endosymbiosis of CYANOBACTERIA. They are characterized by a mainly photosynthetic mode of nutrition; essentially unlimited growth at localized regions of cell divisions (MERISTEMS); cellulose within cells providing rigidity; the absence of organs of locomotion; absence of nervous and sensory systems; and an alternation of haploid and diploid generations.
The exposure to potentially harmful chemical, physical, or biological agents by inhaling them.
Substances or energies, for example heat or light, which when introduced into the air, water, or land threaten life or health of individuals or ECOSYSTEMS.
A measure of the amount of WATER VAPOR in the air.
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
Inorganic oxides that contain nitrogen.
Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.
Oils which evaporate readily. The volatile oils occur in aromatic plants, to which they give odor and other characteristics. Most volatile oils consist of a mixture of two or more TERPENES or of a mixture of an eleoptene (the more volatile constituent of a volatile oil) with a stearopten (the more solid constituent). The synonym essential oils refers to the essence of a plant, as its perfume or scent, and not to its indispensability.
The class Insecta, in the phylum ARTHROPODA, whose members are characterized by division into three parts: head, thorax, and abdomen. They are the dominant group of animals on earth; several hundred thousand different kinds having been described. Three orders, HEMIPTERA; DIPTERA; and SIPHONAPTERA; are of medical interest in that they cause disease in humans and animals. (From Borror et al., An Introduction to the Study of Insects, 4th ed, p1)
Particles of any solid substance, generally under 30 microns in size, often noted as PM30. There is special concern with PM1 which can get down to PULMONARY ALVEOLI and induce MACROPHAGE ACTIVATION and PHAGOCYTOSIS leading to FOREIGN BODY REACTION and LUNG DISEASES.
Derivatives of ACETIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the carboxymethane structure.
Measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, environmental exposure and its effects, disease diagnosis, metabolic processes, substance abuse, pregnancy, cell line development, epidemiologic studies, etc.
Mathematical procedure that transforms a number of possibly correlated variables into a smaller number of uncorrelated variables called principal components.
Chemical and physical transformation of the biogenic elements from their nucleosynthesis in stars to their incorporation and subsequent modification in planetary bodies and terrestrial biochemistry. It includes the mechanism of incorporation of biogenic elements into complex molecules and molecular systems, leading up to the origin of life.
Inorganic or organic compounds that contain sulfur as an integral part of the molecule.
The ability to detect scents or odors, such as the function of OLFACTORY RECEPTOR NEURONS.
When oxides of nitrogen (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, ground level ozone is ... "Volatile Organic Compounds (VOCs)". Toxic Substances Hydrology Program. United States Geological Survey (USGS). 12 April 2013. ... "State and County Emission Summaries: Volatile Organic Compounds". Air emission sources. United States Environmental Protection ... A 2005 U.S. EPA report gives road vehicles as the second largest source of VOCs in the U.S. at 26% and 19% are from non road ...
Volatile organic compounds, or VOCs, are organic compounds that can easily become vapors or gases. These compounds are released ... "Tox Town - Volatile Organic Compounds (VOCs) - Toxic chemicals and environmental health risks where you live and work". Toxtown ... "Volatile Organic Compounds (VOCs)". Toxtown.nlm.nih.gov. Retrieved 25 September 2017. TendersInfo. ""United States: EPA ... The contaminants include polychlorinated biphenyls (PCBs), pesticides, volatile organic compounds (VOCs), semiVOCs and heavy ...
... such as volatile organic compounds or VOCs, which evaporate in the air. VOC's are organic compounds that become a gas ... "Volatile Organic Compounds (VOCs)". Tox Town. Tox Town. Retrieved 28 September 2017. Agency for Toxic Substances and Disease ... These chemicals included volatile organic compounds (VOCs), Polychlorinated Biphenyls (PCBs), Trichloroethene and Vinyl ... ESL disposed of liquid and solid waste including many chemicals such as volatile organic compounds (VOCs), Polychlorinated ...
"Volatile Organic Compounds (VOCs)". Toxtown.nlm.nih.gov. Retrieved 21 September 2017. "National Center for Biotechnology ...
In contrast to volatile organic compounds (VOCs), non-volatile organic compounds are those carbon compounds that do not ... Volatile Organic Compounds (VOCs): Technical Overview. United States Environmental Protection Agency. http://www.epa.gov/iaq/ ... The chemical cue obtained by an animal exhibiting the flehmen response is the presence of a non-volatile organic compound. ... The VNO detects non-VOCs, which must have direct contact with the odor source. Sources of non-VOCs relevant to the flehmen ...
It releases no volatile organic compounds (VOCs). The automated roll forming system produces components to the exact length ...
VOCs (volatile organic compounds) - such as formaldehyde; can be found in drinking water and sewage systems. Dioxins are a ... Sublethal effects - toxins or compounds that do not induce significant mortality but make the organism sick or make it change ... class of chemical compounds that are formed as a result of combustion processes such as waste incineration and from burning ...
Human breath contains volatile organic compounds (VOCs). These compounds consist of methanol, isoprene, acetone, ethanol and ... Fenske, Jill D.; Paulson, Suzanne E. (1999). "Human Breath Emissions of VOCs". Journal of the Air & Waste Management ...
Low volatile organic compounds (VOCs) paint covers the walls. Mother Earth Brewing's corporate offices sport eco carpet ...
ERH is typically most effective on volatile organic compounds (VOCs). The chlorinated compounds perchloroethylene, ... Summer 2014 Electrical Resistance Heating of Volatile Organic Compounds in Sedimentary Rock - Remediation Journal, Winter 2014 ... Peat or high organic carbon in the subsurface will preferentially adsorb VOCs due to van der Waals forces. This preferential ... For mutually soluble compounds, Raoult's law states that the partial pressure of a compound is equal to its vapor pressure ...
Sorbent tubes are passive samplers for volatile organic compounds (VOCs). They are glass tubes filled with adsorbing materials ... Polar organic chemical integrative samplers (POCIS) sample polar organic contaminants with a log octanol-water partition ... The adsorbing materials remove VOCs from the air that passes through them, and the VOCs can be desorbed and analyzed. Air ... and other organic compounds in water, while some passive samplers can detect hazardous substances in the air. The underlying ...
Volatile organic compounds (VOCs) are a dangerous contaminant of groundwater. They are generally introduced to the environment ... Organic pollutants can also be found in groundwater as insecticides and herbicides. As many other synthetic organic compounds, ... Other organic pollutants include a range of organohalides and other chemical compounds, petroleum hydrocarbons, various ... October 2015). "Elevated levels of diesel range organic compounds in groundwater near Marcellus gas operations are derived from ...
Trace amounts of other volatile organic compounds (VOCs) comprise the remainder (. ... Landfill gas is a mix of different gases created by the action of microorganisms within a landfill as they decompose organic ...
Trace amounts of other volatile organic compounds (VOCs) comprise the remainder (. ... Landfill gas is a mix of different gases created by the action of microorganisms within a landfill as they decompose organic ... Biodegradable waste includes any organic matter in waste which can be broken down into carbon dioxide, water, methane or simple ... Such materials include gypsum and its products such as plasterboard and other simple organic sulfates which can decompose to ...
Volatile Organic Compounds (VOCs) are also found in the subsurface gas. VOCs and several metals with concentrations above ... Contaminants in the soil include 11 metals, 7 chlorinated pesticides, 16 volatile organic compounds (VOCs), polyaromatic ... and xylene Semivolatile Organic Compounds - benzo(a)pyrene, 2-chlorophenol, naphthalene, 2-methylnaphthalene, 4-nitrophenol, ... The constituents of these wastes include: Metals - arsenic, beryllium, thallium, and lead VOCs - toluene, methylene chloride, ...
... emits environmentally significant amounts of volatile organic compounds (VOCs) on warmer days. These VOCs react with primary ... Volatile organic compounds (VOC) - VOCs are a well-known outdoor air pollutant. They are categorized as either methane (CH4) or ... Paint and solvents give off volatile organic compounds (VOCs) as they dry. Lead paint can degenerate into dust and be inhaled. ... and Volatile Organic Compound Exposures in Office Workers: A Controlled Exposure Study of Green and Conventional Office ...
The European Council directive 1999/13/EC defines volatile organic compounds (VOCs) as "any organic compound having at 293.15 K ... Volatolomics is a branch of chemistry that studies volatile organic compounds (VOCs) emitted by a biological system, under ... Molecules 18, 1783-1797 (2013). Insam, H. & Seewald, M. S. A. Volatile organic compounds (VOCs) in soils. Biol. Fertil. Soils ... Characterization of volatile organic compounds emitted by barley (Hordeum vulgare L.) roots and their attractiveness to ...
When a herbivore consumes a plant, it releases volatile organic compounds (VOCs). Because VOCs are a chemical signal that ... Piesik, D.; Panka, D.; Delaney, K. J.; Skoczek, A.; Lamparski, R.; Weaver, D. K. (2011). "Cereal crop volatile organic compound ... Most likely, a secondary compound in barley incites an eating response, perhaps when a lack of desired food is present. ... Volatile induction of infected and neighboring uninfected plants has the potential to attract a pest cereal leaf beetle, Oulema ...
"Volatile Organic Compounds (VOCs) in Your Home - EH: Minnesota Department of Health". www.health.state.mn.us. Archived from the ... Retrieved 2017-11-30.CS1 maint: multiple names: authors list (link) "Volatile Organic Compounds (VOCs) in Commonly Used ... classifies Volatile Organic Compounds (VOCs) as gases emitted from certain solids and liquids that may have adverse health ... In 1997, the State of Illinois adopted a trading program for volatile organic compounds in most of the Chicago area, called the ...
Sensing of humidity and volatile organic compounds (VOCs) are demonstrated by using FBARs. A tactile sensor array may also ... However two compound materials aluminium nitride (AlN) and zinc oxide are the two most studied piezoelectric materials ... This is due to the fact that the properties like stoichiometry of two compound materials can be easier to control compared to ... but two compound piezoelectric materials are favored due to simplicity of manufacturing. Doping or adding new materials like ...
Identified contaminants Metals and volatile organic compounds (VOCs) in groundwater and surface water. Current actions The Navy ...
Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, ... IAQ can be affected by gases (including carbon monoxide, radon, volatile organic compounds), particulates, microbial ... Fuels are made up of organic chemicals. All of these products can release organic compounds during usage, and, to some degree, ... particularly volatile organic compounds (VOC) such as benzene, toluene, and xylene. Plants remove CO2 and release oxygen and ...
Automated monitoring of volatile organic compounds (VOCs) is a desired functionality for LOC. If this application becomes ... reliable, these micro-devices could be installed on a global scale and notify homeowners of potentially dangerous compounds. ...
The host plant releases volatile organic compounds (VOCs) that attract the insect's predators. The plants connected by ... The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus, and the fungus supplies to ... Another form of immobilisation is when nutrients are locked up in organic matter that is slow to decay, such as wood, and some ... For example, they may secrete organic acids that dissolve or chelate many ions, or release them from minerals by ion exchange. ...
Volatile organic compounds (VOCs) are organic chemicals, some of which occur naturally in oil and gas, that have high vapor ... Williams, J., & Koppmann, R. (2007). Volatile Organic Compounds in the Atmosphere: An Overview. Volatile Organic Compounds in ... Where hv is UV radiation and R is a volatile organic compound (VOC). Additionally, some organic compounds (notably aldehydes) ... "Plant Volatile Organic Compounds (VOCs) in Ozone (O3) Polluted Atmospheres: The Ecological Effects". Journal of Chemical ...
The volatile organic compounds (VOCs) are associated with causing smog and acid rain. With the increasing amount of waste ... and volatile organic compounds (such as hydrogen sulfide (H2S), N2O2, etc.). Methane gas, a strong greenhouse gas, can build up ... The aerobic environment decomposition is accelerated and amount of VOCs, toxicity of leachate and methane are minimised. In ... Bioreactor landfills produce lower quantities of VOCs than traditional landfills, except H2S. Bioreactor landfills produce ...
FMC site groundwater is contaminated with volatile organic compounds (VOCs) including trichloroethylene (TCE). Soil that was ... Although concentrations of VOCs in groundwater have decreased in most monitoring wells, pumping will continue until cleanup ... However, the surface water intake was moved further downstream and no exceedences of VOCs have been detected in the intake ... in groundwater wells located near the Mississippi River and is believed to have contributed to the detection of VOCs in the ...
"Volatile Organic Compounds (VOCs) Technical Overview" U.S. Environmental Protection Agency, Indoor Air. Retrieved 2013-08-28. " ... VOC BioTreat™ is a U.S. patent pending technology from Ramboll Environ that destroys volatile organic compounds (VOCs) by ... He is recognized by the EPA as an expert in the development of cost-effective volatile organic compounds (VOC) control ... "VOC BIOTREAT: A cost-effective solution for the biodestruction of volatile organic compound emissions" ENVIRON. Retrieved 2013- ...
Unlike solvent-based wet paint systems, the process uses no volatile organic compounds (VOCs). In addition, there is no release ...
The groundwater contains lead and volatile organic compounds (VOCs) like benzene, xylene, and toluene. Several areas of ... In 2014, Eielson tested waters and soils for perfluorinated compounds around areas where "Aqueous Film Forming Foam" had been ...
Ground-level ozone, or smog, is created by chemical reactions between NOx and volatile organic compounds (VOCs) in the presence ... The volatile components of asphalt pavement evaporate more slowly in shaded parking lots and streets. The shade not only ... trees and other plants are the major sources of VOCs. Particulate pollution, or particulate matter (PM10 and PM25), is made up ...
... contained in several household cleaning products can react to generate chlorinated volatile organic compounds (VOCs).[26] These ... The increase in chlorinated volatile organic compound concentrations was the lowest for plain bleach and the highest for the ... Odabasi, M., Halogenated Volatile Organic Compounds from the Use of Chlorine-Bleach- Containing Household Products, Slide ... Odabasi, Mustafa (March 2008). "Halogenated Volatile Organic Compounds from the Use of Chlorine-Bleach-Containing Household ...
Volatile organic compounds (VOCs) are released from many household cleaning products such as disinfectants, polishes, floor ... These products have been shown to emit irritating vapors.[9][15][16] VOCs are of most concern due to their tendency to ... organic matter, animal dander, particles from combustion, fibers from insulation, pollen, and polycyclic aromatic hydrocarbons ... Of most concern are the family of chemicals called VOCs such as formaldehyde, toluene, and limonene.[14] ...
This chemical poses environmental hazards because it reacts to cause halogenated volatile organic compounds (VOCs).[6] Such ... Sources of Volatile Organic Compounds. "Solvent use" is the source that originates from cleaning chemicals. ... Odabasi, Mustafa; Elbir, Tolga; Dumanoglu, Yetkin; Sofuoglu, Sait C. (2014-08-01). "Halogenated volatile organic compounds in ... Environmental impacts of cleaning products entail the consequences that come as a result of chemical compounds in cleaning ...
Volatile organic compounds (VOCs) were found to be in Camp Lejeune's drinking water supply.[7] VOC contamination of groundwater ...
The model reports energy use, greenhouse gas emissions, and six additional pollutants: volatile organic compounds (VOCs), ...
... or flower scent is composed of all the volatile organic compounds (VOCs), or aroma compounds, emitted by floral ... This is more adapted to the study of heavier organic compounds, and/or VOCs that are stored in floral tissue before being ... Synthesis of floral VOCsEdit. Most floral VOCs belong to three main chemical classes.[2][6] VOCs in the same chemical class are ... "Conditions for the optimal analysis of volatile organic compounds in air with sorbent tube sampling and liquid standard ...
... emits environmentally significant amounts of Volatile organic compounds (VOCs) on warmer days. These VOCs react with primary ... Volatile organic compounds (VOC) - VOCs are a well-known outdoor air pollutant. They are categorized as either methane (CH4) or ... Paint and solvents give off volatile organic compounds (VOCs) as they dry. Lead paint can degenerate into dust and be inhaled. ... Thermal oxidisers are air pollution abatement options for hazardous air pollutants (HAPs), volatile organic compounds (VOCs), ...
Pietro Buzzini u. a. (2005), "Production of volatile organic compounds (VOCs) by yeasts isolated from the ascocarps of black ( ... Franco Bellesia; Adriano Pinetti; Alberto Bianchi; Bruno Tirillini (1998), "The volatile organic compounds of black truffle ( ... The volatile compounds that contribute to the aroma and are developed by the fruiting bodies include 2-methyl-1-butanol, ... which produce part of the aromatic compounds, have been isolated from Tuber melanosporum and Tuber magnatum.[9] ...
Volatile organic compounds (VOCs) may have higher concentrations in confined indoor environments, due to restricted ... Most odors consist of organic compounds, although some simple compounds not containing carbon, such as hydrogen sulfide and ... Some inhaled chemicals are volatile compounds that act as a stimulus, triggering unwanted reactions such as nose, eye, and ... The olfactory system does not interpret a single compound, but instead the whole odorous mix. This does not correspond to the ...
Icynene contains no VOC's, Volatile organic compounds (VOCs) Many VOCs are dangerous to human health or cause harm to the ... However, a respirator with an organic vapor sorbent may be advisable in some cases, for example if the foam is heated. Very ... Formaldehyde is a common building block for the synthesis of more complex compounds and materials, its extremely toxic to many ...
... contained in several household cleaning products can react to generate chlorinated volatile organic compounds (VOCs).[54] These ... The increase in chlorinated volatile organic compound concentrations was the lowest for plain bleach and the highest for the ... Odabasi M (March 2008). "Halogenated volatile organic compounds from the use of chlorine-bleach-containing household products ... Oxidation of organic compoundsEdit. Oxidation of starch by sodium hypochlorite, that adds carbonyl and carboxyl groups, is ...
Volatile organic compounds (VOCs) are organic chemicals that have a high vapor pressure at ordinary room temperature. Their ... very volatile organic compounds); compounds appearing later are called SVOC (semi-volatile organic compounds). ... "Volatile Organic Compounds (VOCs) in Your Home - EH: Minnesota Department of Health". Health.state.mn.us. Retrieved 2018-01-23. ... Volatile Organic Compounds (VOCs) web site of the Chemicals Control Branch of Environment Canada ...
Volatile organic compounds (VOCs) are organic chemicals that have a high vapor pressure at ordinary room temperature. Their ... very volatile organic compounds); compounds appearing later are called SVOC (semi-volatile organic compounds). See also these ... Volatile Organic Compounds (VOCs) web site of the Chemicals Control Branch of Environment Canada ... 2009). "Analysis of industrial contaminants in indoor air: Part 1. Volatile organic compounds, carbonyl compounds, polycyclic ...
... recent analysis of the chemical composition of volatile organic compounds (VOCs) from King Penguin feathers suggest that VOCs ... The tendrils of plants are especially sensitive to airborne volatile organic compounds. Parasites such as dodder make use of ... The emission of volatile compounds is detected when foliage is browsed by animals. Threatened plants are then able to take ... which detects volatile stimuli, and an accessory olfactory system, which detects fluid-phase stimuli. Behavioral evidence ...
Volatile organic compounds (VOCs) in paint are considered harmful to the environment and especially for people who work with ... Recent environmental requirements restrict the use of volatile organic compounds (VOCs), and alternative means of curing have ... Exposure to VOCs has been related to organic solvent syndrome, although this relation has been somewhat controversial.[30] The ... Specific examples are organic solvents such as petroleum distillate, esters, glycol ethers, and the like. Sometimes volatile ...
... the latter part deriving from the oxidation of volatile organic compounds (VOCs); organic material in the atmosphere may either ... In addition, sea spray aerosols may contain organic compounds, which influence their chemistry. The drift/mist emissions from ... Organic matter and elemental carbon together constitute the carbonaceous fraction of aerosols.[21] Secondary organic aerosols ( ... It should be distinguished from organic carbon (OC): clustered or aggregated organic molecules on their own or permeating an EC ...
Safer than oil-based and polyurethane, fewer volatile organic compounds. Brush or better spray. Fast drying demands care in ... low or free of VOCs, nonreactive when cured. generally sprayed, equipment must be cleaned of any mixed product immediately. ... Wood can also be coloured by exposing it to chemicals that react with the wood to form coloured compounds. Chemical staining of ... Wood surfaces are occasionally affected by various organic and inorganic stains.[24] Sometimes such stains enhance the colour ...
"Volatile Organic Compounds (VOCs) in Your Home - EH: Minnesota Department of Health". www.health.state.mn.us. Retrieved 2017-11 ... "Volatile Organic Compounds (VOCs) in Commonly Used Products". www.health.ny.gov. Retrieved 2017-11-30.. ... In the United States the Environmental Protection Agency (EPA) classifies Volatile Organic Compounds (VOCs) as gases emitted ... "Volatile Organic Compounds' Impact on Indoor Air Quality , US EPA". US EPA. Retrieved 2017-11-30.. CS1 maint: Multiple names: ...
Volatile organic compounds (VOC) - Categorized as either methane or non-methane. Methane is an extremely efficient greenhouse ... Ground level ozone (O3) formed from NOx and VOCs. Abnormally high concentrations are brought about by human activities (mostly ... For sulphur dioxide and volatile organic compounds it is sufficient to apply the measures already adopted and implemented in ... Particulates created from gaseous primary pollutant and compounds in photochemical smog. Smog is a kind of air pollution and ...
... were observed in performance scores in environments with increasing concentrations of either volatile organic compounds (VOCs) ... and Volatile Organic Compound Exposures in Office Workers: A Controlled Exposure Study of Green and Conventional Office ... These spaces can be structured or fully natural and organic. The model can also involve any activities and spaces other than in ...
... recent analysis of the chemical composition of volatile organic compounds (VOCs) from King Penguin feathers suggest that VOCs ... The tendrils of plants are especially sensitive to airborne volatile organic compounds. Parasites such as dodder make use of ... Insect olfaction refers to the function of chemical receptors that enable insects to detect and identify volatile compounds for ... Insects are capable of smelling and differentiating between thousands of volatile compounds both sensitively and selectively.[ ...
... is a vehicle fuel vapor emission control system that captures volatile organic compounds (VOC, potentially harmful vapors) ... It has a mechanism which closes the vent in the event the vehicle rolls over, to prevent spilling of VOCs or fuel in general. ...
... some VOCs [volatile organic compounds], some heavy metals, and nicotine" and "[i]t is nevertheless reasonable to assume that ... and organic volatile compounds, in addition to particulates.[255] ... "Carbonyl Compounds Generated from Electronic Cigarettes". International Journal of Environmental Research and Public Health ... "Carbonyl Compounds in Electronic Cigarette Vapors: Effects of Nicotine Solvent and Battery Output Voltage". Nicotine & Tobacco ...
The industry is the largest industrial source of emissions of volatile organic compounds (VOCs), a group of chemicals that ... Pollutants include nitrogen oxides, sulphur dioxide, volatile organic compounds and heavy metals. ... It consists of a complex mixture of hydrocarbons of various molecular weights, plus other organic compounds. It is generally ...
"Volatile Organic Compounds (VOCs)". Toxic Substances Hydrology Program. United States Geological Survey (USGS). 12 April 2013. ... When oxides of nitrogen (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, ground level ozone is ... NMOG (Volatile organic compounds) 0.075 grams/mile (0.046 g/km) 2.1 pounds (0.95 kg) ... "State and County Emission Summaries: Volatile Organic Compounds". Air emission sources. United States Environmental Protection ...
P&T GC-MS is particularly suited to volatile organic compounds (VOCs) and BTEX compounds (aromatic compounds associated with ... "Optimizing the Analysis of Volatile Organic Compounds - Technical Guide" Restek Corporation, Lit. Cat. 59887A ... The volatile compounds are drawn along a heated line onto a 'trap'. The trap is a column of adsorbent material at ambient ... The volatile compounds move into the headspace above the water and are drawn along a pressure gradient (caused by the ...
The groundwater contains lead and volatile organic compounds (VOCs) like benzene, xylene, and toluene. Several areas of ... In 2014, Eielson tested waters and soils for perfluorinated compounds around areas where "Aqueous Film Forming Foam" had been ...
Emissions from fused filament printers can include a large number of ultrafine particles and volatile organic compounds (VOCs ... "Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers ... Excessive exposure to VOCs can lead to irritation of the eyes, nose, and throat, headache, loss of coordination, and nausea and ... No chromium(VI) compounds were detected in the workplace air during the process when materials containing chromium were ...
Such materials release volatile organic compounds, via outgassing or offgassing. These fumes are generally attributed mixtures ... Ritter, Steve (2002). "New Car Smell: VOCs Account for the Characteristic 'Newness'". Chemical and Engineering News. 80 (20): ... The total volatile organic compound levels can reach 7,500 micrograms per cubic meter. Concentrations decayed approximately 90 ... A 1995 analysis of the air from a new Lincoln Continental found over 50 volatile organic compounds, which were identified as ...
About Volatile Organic Compounds (VOCs). Volatile organic compounds (VOCs) are carbon containing chemicals that vaporize and ... About Volatile Organic Compounds (VOCs). Removing VOCs from the Air CDPHs Position on VOCs CDPHs Publications on VOCs over ... Volatile Organic Compounds (VOCs). Quick link. Standard Method for Testing and Evaluation of Volatile Organic Chemical ... develop nonbinding guidelines for the reduction of exposure to volatile organic compounds (VOCs) from construction materials in ...
... are chemicals that both vaporize into air and dissolve in water. VOCs are pervasive in daily ... This national assessment of 55 volatile organic compounds (VOCs) in ground water gives emphasis to the occurrence of VOCs in ... MTBE and other volatile organic compounds (VOCs) are widely observed in shallow groundwater in the United States, especially in ... and VOCs are used in the synthesis of other organic compounds. VOCs also are used in dry cleaning, in refrigeration units, and ...
Volatile Organic Compounds (Whole Blood). Volatile organic compounds (VOCs) are a large group of chemicals that have been used ... Volatile Organic Compounds (VOCs) - Blood (VOCWB_G) Data File: VOCWB_G.xpt First Published: April 2017. Last Revised: NA Note: ... Blood volatile organic compound (VOC) results for styrene and toluene will not be publicly released for the NHANES 2011-2012 ... Volatile Toxicant Questionnaire. A volatile toxicant questionnaire (VTQ) was administered on the mobile examination center (MEC ...
Volatile Organic Compounds (Home Tap Water) - Trihalomethanes/MTBE. Volatile organic compounds (VOCs) are a large group of ... Volatile Organic Compounds (VOCs) - Water (VOC_F) Data File: VOC_F.xpt First Published: August 2017. Last Revised: NA ... Volatile Toxicant Questionnaire. A volatile toxicant questionnaire (VTQ) was administered on the mobile examination center (MEC ... The lower limit of detection (LLOD, in ng/mL) for water -Trihalomethanes/MTBE VOCs ...
VOCs) and indoor air quality, what VOCs are and where they come from, health concerns, how to avoid VOCs, and proper ... What are volatile organic compounds (VOCs)? Volatile organic compounds (VOCs) are gases that are given off by a number of ... Concentrations of most volatile organic compounds are higher in indoor air than outdoor air. ... Where do VOCs come from? Formaldehyde is one of the most common VOCs. Formaldehyde is a colourless gas with a strong smell. It ...
... What Are VOCs?. Volatile organic compounds are chemicals that ... VOCs are not found in organic latex mattresses, as mentioned. Organic latex mattress toppers dont contain volatile organic ... Its time to make the switch to an organic latex mattress if youre worried about volatile organic compounds getting into your ... Wherever possible, try to opt for an organic latex mattress since they dont have volatile organic compounds. ...
It visualizes and pinpoints leaks of Volatile Organic Compounds (VOCs), without the need to shut down the operation. This ... The FLIR GF320 is an IR camera for optical gas imaging that visualizes and pinpoints leaks of Volatile Organic Compounds (VOCs ... Optical Gas Imaging of Volatile Organic Compounds (VOCs). Product News: Optical Gas Imaging of Volatile Organic Compounds (VOCs ... This highly sensitive detector, that operates in the 3.2 - 3.4 micrometer waveband, not only visualizes VOCs, but also the ...
VOCs) which are water contaminants such as Carbofuran, Carbon Tetrachloride, Chlorobenzene and Lindane. ... VOCs (Volatile Organic Compounds). Contaminant. Description. EPA Designation. 1,1,1-Trichloroethane. 1,1,1-Trichloroethane is ... Chlorobenzene is an aromatic organic compound with the chemical formula C6H5Cl. This colorless, flammable liquid is a common ...
Composition and Atmospheric Reactivity of Ambient Volatile Organic Compounds(VOCs)in the Urban Area of Nanjing, China].. [ ... chemical reactivity; ozone formation potential; volatile organic compounds(VOCs); volume fraction; ·OH loss rate ... systems were employed to observe 56 species of volatile organic compounds (VOCs) in the environmental atmosphere in Nanjing in ... The highest concentration of VOCs was in April (22.21×10-9), and the lowest in July (12.39×10-9). Diurnal values of VOCs ...
VOCs) has been an indoor environmental quality (IEQ) concern in schools and other buildings for many years. Newer designs, ... Volatile Organic Compounds (VOCs) in Conventional and High Performance School Buildings in the U.S.. Lexuan Zhong. ... "Volatile Organic Compounds (VOCs) in Conventional and High Performance School Buildings in the U.S.." Int. J. Environ. Res. ... Keywords: volatile organic compounds (VOCs); formaldehyde; schools; indoor/outdoor (I/O) ratio; air exchange rate (AER); high ...
VOCs). Individual integration analysis and real time monitoring can be used to qualitatively and quantitatively analyze VOCs in ... In comparison with background concentrations, the results of peak analysis enabled identification of compounds whose ... This enabled qualitative and quantitative analysis of VOCs when the TVOC concentration was high. We developed an algorithm to ... With the system, auto-sampling and analysis of VOCs in a conventional house were conducted. ...
Testing Spectrosense EVA System for Detection of Breast Cancer by Analyzing Volatile Organic Compounds (VOCs) in Exhaled Air. ... Volatile Organic Compounds (VOC) in human breath are captured and analyzed by the Spectrosense EVA system, which is combination ...
Testing Spectrosense EVA System for Detection of Pancreatic Cancer by Analyzing Volatile Organic Compounds (VOCs) in Exhaled ... Testing Spectrosense EVA System for Detection of Pancreatic Cancer by Analyzing Volatile Organic Compounds (VOCs) in Exhaled ... Volatile Organic Compounds (VOC) in human breath are captured and analyzed by the Spectrosense EVA system, which is combination ... An optimization algorithm will select VOCs that will provide maximal sensitivity and specificity. ...
VOCs) and Semi-Volatile Organic Compounds (SVOCs) Emission Testing Methods to Determine Emission Parameters for Modeling of ... Indoor Environments VOC emission~ indoor environmental quality~ semi-volatile organic compounds~ ... D8141-17 Standard Guide for Selecting Volatile Organic Compounds ( ... ASTM D8141-17, Standard Guide for Selecting Volatile Organic Compounds (VOCs) and Semi-Volatile Organic Compounds (SVOCs) ...
... formation of volatile organic compounds (VOCs) during non-haze and haze days, ambient VOCs were continuously measured by... ... To better understand the characterization and secondary organic aerosol (SOA) ... Volatile organic compounds (VOCs) during non-haze and haze days in Shanghai: characterization and secondary organic aerosol ( ... To better understand the characterization and secondary organic aerosol (SOA) formation of volatile organic compounds (VOCs) ...
... ORNL DAAC, Oak Ridge, Tennessee, USA. ... ATom: L2 Volatile Organic Compounds (VOCs) from the Trace Organic Gas Analyzer (TOGA) Get Data ... Trace Organic Gas Analyzer TOGA measures volatile organic compounds (VOCs). Specific data will be obtained for radical ... ATom: L2 Volatile Organic Compounds (VOCs) from the Trace Organic Gas Analyzer (TOGA) ...
... ... CitationRosell, M.; Carrasco, A.; Gallego, E. Evaluation of work-related volatile organic compounds (VOCs) exposition in ... being great part of them mixtures of volatile organic compounds (VOCs), where the three xylene isomers are the most important ... This evaluation has been done in order to assess the occupational exposure to VOCs and to know the working conditions of the ...
... to develop a management plan for the control of NOx and VOCs. A ?Phase I? management plan was subsequently prepared, under the ... Management Plan for Nitrogen Oxides (Nox) and Volatile Organic Compounds (VOCs) Phase I Summary Report Canadian Council of ... Management Plan for Nitrogen Oxides (Nox) and Volatile Organic Compounds (VOCs) Phase I Summary Report. Canadian Council of ... to develop a management plan for the control of NOx and VOCs. A ?Phase I? management plan was subsequently prepared, under the ...
VOCs) are chemicals that have a low boiling point. Some VOCs are harmful to human health, whereas others can be used to ... Volatile Organic Compounds (VOCs). Volatile organic compounds (VOCs) are chemicals that have a low boiling point. Some VOCs are ... Determination of Selected Organic Contaminants in Drinking Water by Aqueous Direct Injection and... ... Method development for compounds contained within a biological sample matrix is extremely challengi... ...
Volatile organic compounds (VOCs), Volatilome.. Abstract:Volatile organic compounds (VOCs) offer unique insights into ongoing ... A Compendium of Volatile Organic Compounds (VOCs) Released By Human Cell Lines. Author(s): Wojciech Filipiak, Pawel Mochalski, ... Keywords: Biomarker, Breath analysis, Cancer, GC-MS, Human cell lines, Standardization, Volatile organic compounds (VOCs), ... Volatile organic compounds (VOCs) offer unique insights into ongoing biochemical processes in healthy and diseased humans. Yet ...
The concentration of 92 compounds was measured in the end-tidal breath of 65 cases and 102 controls. VOCs were measured with an ... The objective of the present work was to analyse the VOCs in alveolar air to build a diagnostic tool able to identify the ... Pancreatic cancer is able to alter the concentration of some molecules in the blood and hence of VOCs in the alveolar air in ... The final predictive model, based on 10 VOCs, significantly and independently associated with the outcome had a sensitivity and ...
Volatile organic compounds (VOCs). VOCs are emitted by a wide array of products used in homes including:. *paints and lacquers ... Volatile organic compounds (VOCs): are chemicals that evaporate at room temperature. VOCs are released from products into the ... Volatile Organic Compounds. VOCs cause eye, nose and throat irritation, headaches, nausea, and can damage the liver, kidney, ... Volatile organic compounds irritate the eyes, nose and throat, and cause headaches, nausea, and damage to the liver, kidneys ...
Volatile Organic Compounds (VOCs). VOCs are a large class of organic chemicals (i.e., containing carbon) that have a ... "Total Volatile Organic Compounds" (TVOC) as an indicator of human responses to exposures of volatile organic compounds (VOC) in ... Volatile Organic Compounds (VOCs). Individual VOCs were identified with thermal desorption tubes that were analyzed in the ... Volatile Organic Compounds (VOCs). Individual VOCs were identified with thermal desorption tubes. As with the Brentwood samples ...
Volatile organic compounds (VOCs) are organic chemicals that have a high vapor pressure at ordinary room temperature. Their ... very volatile organic compounds); compounds appearing later are called SVOC (semi-volatile organic compounds). ... "Volatile Organic Compounds (VOCs) in Your Home - EH: Minnesota Department of Health". Health.state.mn.us. Retrieved 2018-01-23. ... Volatile Organic Compounds (VOCs) web site of the Chemicals Control Branch of Environment Canada ...
Volatile Organic Compounds (VOCs). Some building materials release gases called VOCs. Common VOC sources include:. *Caulks, ...
DD--Volatile Organic Compounds (VOCs). Volatile Organic Compounds (VOCs). Overview.. Organic chemical compounds are everywhere ... "Speciation of the Volatile Organic Compounds (VOCs) in Low VOC Content Waterborne Air-Dry Coatings by Gas Chromatography", ... In addition to these named compounds, Method 8260 can be used to quantitate most volatile organic compounds that have boiling ... VOCs are organic chemical compounds whose composition makes it possible for them to evaporate under normal indoor atmospheric ...
Little is known about their exposure to chemicals, including volatile organic compounds (VOCs). This study evaluates VOC ... Occupational Exposure and Health Risks of Volatile Organic Compounds (VOCs) of Hotel Housekeepers Field Measurements of ... Occupational Exposure and Health Risks of Volatile Organic Compounds (VOCs) of Hotel Housekeepers Field Measurements of ... was found to be contaminated with volatile organic chemicals (VOCs). The... ...
Volatile organic compounds (VOCs) analysis. To sample VOCs, charcoal sorbent tubes (SKC Anasorb CSC 400/200) were inserted ... Table 3 Carbonyls and volatile organic compounds (VOCs) concentrations measured in the vapors of liquid refills mixtures ( ... Table 4 Carbonyls and volatile organic compounds (VOCs) composition and concentrations determined in the vapors of tobacco ... volatile organic compounds (VOCs) and carbonyls residues were considered in this evaluation. ...
Volatile Organic Compounds Vocs, supplied by Millipore, used in various techniques. Bioz Stars score: 94/100, based on 1 PubMed ... volatile organic compounds (VOCs. ) (Sigma-Aldrich) were tested by spotting up to 100 ppm onto a filter paper contained within ... Millipore volatile organic compounds vocs. This proficiency testing sample is produced in accordance with ISO IEC 17043 2010 ... Volatile organic compounds (VOCs. ) in the experimental condition of Japanese cedar essential oil were collected using PEJ-02 ...
Volatile organic compounds, often abbreviated VOCs are emitted as gases from certain solids or liquids. VOCs include a variety ... www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality. ... www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality ... All of these products can release organic compounds while you are using them, and, to some degree, when they are stored.. ...
  • Formaldehyde is one of the most common VOCs. (healthlinkbc.ca)
  • 4 This test is performed on samples which have been allowed to "cure" for a period of fourteen days at which time they are tested for emissions - which are categorized as total VOCs, target VOCs (which are considered more harmful) and aldehydes (including formaldehyde). (ecospaints.net)
  • VOCs of greatest health significance included chloroform and formaldehyde. (cdc.gov)
  • There are hundreds of VOCs -- from formaldehyde and ethanol to vinyl, adhesives and varnishes. (diynetwork.com)
  • Moreover, the complaint alleges that Essentia claimed that tests show that its memory foam is free of VOCs and formaldehyde when, in fact, tests do not support these claims. (ftc.gov)
  • Finally, according to the complaint, Ecobaby Organics claimed that tests show that its mattresses are VOC-free, chemical-free, and Formaldehyde-free when tests do not support these claims. (ftc.gov)
  • Common man-made VOCs are benzene, xylene, and formaldehyde. (solomoncolors.com)
  • Note: Blood volatile organic compound (VOC) results for styrene and toluene will not be publicly released for the NHANES 2011-2012 cycle (VOCWB_G, VOCWBS_G), because measured concentrations were significantly biased by elevated background levels that existed in the mobile examination centers (MEC) at the time the blood samples were collected. (cdc.gov)
  • An increase in blood concentrations for those VOCs could be detected in NHANES participants, though the levels encountered by participants and employees in the MECs were well within permissible exposure limits, and reflect those found in common non-occupational environments that exist in recently constructed buildings or vehicles. (cdc.gov)
  • Concentrations of most volatile organic compounds are higher in indoor air than outdoor air. (healthlinkbc.ca)
  • Some VOCs are toxic in high concentrations. (plushbeds.com)
  • Most VOCs had mean concentrations below 5 µg/m 3 , and most indoor/outdoor concentration ratios ranged from one to 10. (mdpi.com)
  • For 16 VOCs, the within-school variance of concentrations exceeded that between schools and, overall, no major differences in VOC concentrations were found between conventional and high performance buildings. (mdpi.com)
  • In comparison with background concentrations, the results of peak analysis enabled identification of compounds whose concentration rose. (mdpi.com)
  • 4.2 Thus, existing methods for characterizing emissions of VOCs may not be practical to properly characterize emission rates of SVOCs for use in modeling SVOC concentrations in indoor environments. (astm.org)
  • 1.1 This guide is intended to serve as a foundation for understanding when to use emission testing methods designed for volatile organic compounds (VOCs) to determine area-specific emission rates that are typically used in modeling indoor VOC concentrations and when to use emission testing methods designed for semi-volatile organic compounds (SVOCs) to determine mass transfer emission parameters that are typically used to model indoor SVOC concentrations. (astm.org)
  • The average concentrations of VOCs in haze episodes (193.2 μg m −3 ) were almost 50% higher than in non-haze periods (130.8 μg m −3 ). (springer.com)
  • VOCs-sensitivity (VOCs-S) based on a PM 2.5 -dependent model was used to investigate the variation between VOCs and PM 2.5 concentrations in the morning rush hour. (springer.com)
  • Civan MY, Elbir T, Seyfioglu R, Kuntasal ÖO, Bayram A, Doğan G (2015) Spatial and temporal variations in atmospheric VOCs, NO 2 , SO 2 , and O 3 concentrations at a heavily industrialized region in Western Turkey, and assessment of the carcinogenic risk levels of benzene. (springer.com)
  • This dataset provides concentrations of volatile organic compounds (VOCs) measured by the Trace Organic Gas Analyzer (TOGA) during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission. (ornl.gov)
  • Anthropogenic VOCs are regulated by law, especially indoors, where concentrations are the highest. (wikipedia.org)
  • Because the concentrations are usually low and the symptoms slow to develop, research into VOCs and their effects is difficult. (wikipedia.org)
  • Concentrations of VOCs are consistently higher indoors (up to ten times higher) than outdoors. (ecopurecincinnati.com)
  • But it is classified by relevant bodies as "Very Volatile," meaning it's easy for large concentrations to accumulate. (foobot.io)
  • Once you have made an accurate choice of the adsorbing material, therefore, you should bear in mind that a real atmosphere is composed by a variety of compounds apart from those you are analyzing at unpredictable concentrations. (sigmaaldrich.com)
  • Although H and P concentrations of most VOCs measured in this study were similar to or lower than levels measured in recent personal monitoring studies of adults and children in the United States, p-dichlorobenzene was the notable exception to this pattern, with upper-bound exposures more than 100 times greater than those found in other studies of children. (thefreelibrary.com)
  • VOCs can cause health problems in high enough concentrations, and a fresh coat of paint may just do the trick. (medicinenet.com)
  • The modeler who made this plot intentionally left off all units of measurement, because the ratio itself is more important than the specific concentrations of the compounds. (nasa.gov)
  • smoking is a source of many pollutants, including VOCs. (healthlinkbc.ca)
  • [11] While the document does not differentiate between VOCs and other air pollutants, the CPCB monitors "oxides of nitrogen (NO x ), sulphur dioxide (SO 2 ), fine particulate matter (PM10) and suspended particulate matter (SPM). (wikipedia.org)
  • As the degree of harm depends on the concentration of VOCs as well as temperature and humidity levels, it is important to be able to detect precisely these pollutants anytime and, above all, on time, before they present a real danger for our loved ones. (medium.com)
  • The cumulative risk from exposure to multiple VOCs and other air pollutants is not known, and limited evidence suggests that the minority populations residing in inner-city neighborhoods have disproportionately higher exposures (Kinney et al. (thefreelibrary.com)
  • VOCs / TVOC VOCs-- volatile organic compounds The detection of organic pollutants represents the pollution of organic matter. (blatn.com)
  • The blood, urine, and breast milk of the "Females" group contained 378-454 of 552 industrial compounds, pollutants and other chemicals tested, including chemicals linked to brain and nervous system toxicity, reproductive toxicity and fertility problems, and immune system toxicity. (ewg.org)
  • Davis Baltz's blood and urine contained 94.116666666667-108 of 214 industrial compounds, pollutants and other chemicals tested, including chemicals linked to immune system toxicity, brain and nervous system toxicity, and birth defects and developmental delays. (ewg.org)
  • A variety of new sorbents have been synthesized for the extraction and concentration of pollutants, including general purpose adsorbents (e.g., porous polystyrene/divinylbenzene resins) and polymers imprinted for specific compounds. (chemweb.com)
  • Most compounds are hazardous air pollutants, so it is more common to be exposed by breathing in the air that is polluted. (wikipedia.org)
  • The average ratio of toluene/benzene (T/B) was 2.02, indicating that the atmospheric VOCs were mainly affected by emissions of motor vehicles, especially gasoline vehicles. (nih.gov)
  • The ratios of toluene to benzene (T/B) and m,p-xylene to ethylbenzene (X/E) indicated that VOCs were aged air mass transported from nearby areas. (springer.com)
  • QAL1 certified by the TUV following EN 14662-3 for benzene monitoring. (environmental-expert.com)
  • Benzene and styrene have been shown to be elevated in homes with smokers, but these compounds also originate from traffic and are often higher in urban areas (Edwards et al. (thefreelibrary.com)
  • A TD-GC-IR-MS method for obtaining d13C of VOCs (benzene, toluene,chlorobenzene, ethylbenzene, m-xylene and propylbenzene) in air samples has been optimised, and is proven to be both reproducible and linear. (edu.au)
  • and volatile organic compounds (VOCs) associated with refined gasoline (benzene, toluene, xylene, methyl tert-butyl ether [MTBE]) or solvents, such as trichloroethene and carbon tetrachloride). (usgs.gov)
  • Volatile organic compounds (VOCs) are carbon containing chemicals that vaporize and can enter the body through normal breathing. (ca.gov)
  • VOCs are chemicals that have high vapor pressures and fairly low boiling points and that tend to vaporize from the liquid or solid state under normal atmospheric conditions. (ca.gov)
  • Volatile organic compounds (VOCs) are chemicals that both vaporize into air and dissolve in water. (usgs.gov)
  • Thousands of VOCs have been manufactured for use-many of these chemicals are toxic and can pose human-health or ecological concerns in drinking water or in the environment. (usgs.gov)
  • Volatile organic compounds (VOCs) are a large group of chemicals that have been used as solvents, degreasers, and cleaning agents in industry and consumer products. (cdc.gov)
  • The health effects caused by VOCs depend on the concentration and length of exposure to the chemicals. (healthlinkbc.ca)
  • Volatile organic compounds are chemicals that are used, in the manufacturing process, of many items found in our homes. (plushbeds.com)
  • The term "volatile" means that these are chemicals that can easily get into the air that you breathe each day and end up inside of your body. (plushbeds.com)
  • Keep in mind that VOCs refer to a group of chemicals. (plushbeds.com)
  • Outgassing is the process your mattress goes through when VOCs are released into the air, from the chemicals in your mattress. (plushbeds.com)
  • This strong odor is due to the VOCs and chemicals in your mattress. (plushbeds.com)
  • 1.2 This guide discusses how organic chemicals are conventionally categorized with respect to volatility. (astm.org)
  • Volatile organic compounds (VOCs) are chemicals that have a low boiling point. (selectscience.net)
  • Volatile organic compounds ( VOCs ) are organic chemicals that have a high vapor pressure at ordinary room temperature . (wikipedia.org)
  • [4] However, this specific use of the term VOCs can be misleading, especially when applied to indoor air quality because many chemicals that are not regulated as outdoor air pollution can still be important for indoor air pollution. (wikipedia.org)
  • All VOCs are not "equal" (some are more toxic than others) and all chemicals in a product are not VOCs (and these non VOCs could be more toxic than the VOCs present). (ecospaints.net)
  • The ability of organic chemicals to cause health effects varies greatly from those that are highly toxic, to those with no known health effect. (ecospaints.net)
  • Little is known about their exposure to chemicals, including volatile organic compounds (VOCs). (cdc.gov)
  • VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects. (ecopurecincinnati.com)
  • When manufacturing a mattress and most of the other items found in our homes, the chemicals used contain volatile organic compounds. (naturalmattressmatters.com)
  • That strong odor that comes with new memory foam mattresses is due to the VOCs and chemicals used when processing your mattress. (naturalmattressmatters.com)
  • Many organic chemicals can be monitored at onec by using Advanced Chemical Sensors Organic Monitoring badge. (environmental-expert.com)
  • Organic chemicals are used widely in household products and release vapours while they are being used, and also while being stored. (blogspot.com)
  • Cleaning supplies, air fresheners, paints and varnishes contain organic chemicals, as do many other products like building materials, furniture, office equipment and even dry-cleaned clothing. (blogspot.com)
  • The word "organic" means that these chemicals contain the element carbon. (greenamerica.org)
  • Volatile organic compounds are chemicals used to manufacture and maintain building materials, interior furnishing, cleaning products and personal care products. (iaqa.org)
  • Volatile" means that these chemicals evaporate or can easily get into the air at room temperature. (iaqa.org)
  • Organic" means these chemicals are carbon based. (iaqa.org)
  • VOCs include a variety of chemicals, some of which may have harmful effects on human health and the environment. (sligococo.ie)
  • These compounds had become widely popular in the 1970s and 1980s for a number of applications, including as chemicals used in refrigeration, as propellants in aerosol sprays, as blowing agents in the manufacture of plastic foams and insulation, as drycleaning fluids, and as cleaning agents for electronic components. (encyclopedia.com)
  • VOCs also come from gasoline combustion and from the evaporation of liquid fuels, solvents and organic chemicals, such as those in some paints, cleaners, barbecue starter, and nail polish remover. (nasa.gov)
  • Evaporation of solvents and organic chemicals from some kinds of paint contribute volatile organic compounds (VOCs) to the air. (nasa.gov)
  • Some VOCs become particularly problematic when they interact with sunlight and chemicals in the air. (feedster.com)
  • VOCs are important ingredients in many concrete coatings, sealers, and chemicals. (solomoncolors.com)
  • 4.1 Emissions of VOCs are typically controlled by internal mass transfer limitations (for example, diffusion through the material), while emissions of SVOCs are typically controlled by external mass transfer limitations (migration through the air immediately above the material). (astm.org)
  • 1.3 This guide presents a simplified mass transfer model describing organic chemical emissions from a material to bulk air. (astm.org)
  • Specific data were obtained for radical precursors, tracers of anthropogenic and biogenic activities, tracers of urban and biomass combustion emissions, products of oxidative processing, precursors to aerosol formation, and compounds important for aerosol modification and transformation. (ornl.gov)
  • The VOC Solvents Emissions Directive is the main policy instrument for the reduction of industrial emissions of volatile organic compounds (VOCs) in the European Union. (wikipedia.org)
  • Article 13 of The Paints Directive, approved in 2004, amended the original VOC Solvents Emissions Directive and limits the use of organic solvents in decorative paints and varnishes and in vehicle finishing products. (wikipedia.org)
  • Standard method for the testing and evaluation of volatile organic chemical emissions from indoor sources using environmental chambers. (ecospaints.net)
  • Determination of TOC in stack through the innovative FID analyser easy to carry PROBLEM: The industrial chimney's emissions of Volatile Organic Compounds (VOCs) are becoming issues of global importance and to have an accurate knowledge about how to test VOC turns into a strategic issue. (environmental-expert.com)
  • Therefore, we generated emissions of a commercially available HNB product following the Health Canada Intense smoking regimen and analyzed total particulate matter (TPM), nicotine, water, aldehydes, and other volatile organic compounds (VOCs) that are major contributors to health risk. (springer.com)
  • The term "chemical emissions" refers to VOCs as they evaporate into the air from products. (iaqa.org)
  • This certification assures the low emissions of volatile organic compounds into the environment. (silestone.com)
  • Sources of VOCs include vehicle emissions, fuel combustion and domestic solvent usage. (sligococo.ie)
  • This paper is a preliminary investigation into the use of a thermal desorption-gas chromatography-isotope ratio mass spectrometry (TD-GC-IR-MS) method to determine stable carbon isotopic compositions (d13C) of low molecular-weight volatile organic compounds (VOCs) in airborne samples (e.g. industrial and car exhaust emissions) as a means of differentiating their sources in the environment. (edu.au)
  • VOC outdoor mainly comes from fuel combustion and transportation;The indoors are mainly from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, construction and decorative materials, furniture, household appliances, detergents and the body's own emissions.Tobacco industry: inks, organic solvents;Textile industry: glue used in footwear products, etc. (blatn.com)
  • Solvents-with consumer and industrial uses such as degreasers, paint removers, and cleaning agents-also are among the VOCs detected in groundwater. (usgs.gov)
  • The halogenated solvents are VOCs consisting of a hydrocarbon chain or one hydrocarbon substituted with one or more chlorine or bromine atoms. (cdc.gov)
  • Automotive painting cabins are cleaned with several solvents, being great part of them mixtures of volatile organic compounds (VOCs), where the three xylene isomers are the most important constituents. (upc.edu)
  • Electrokinetic Remediation, however, begins to shine when managing soil that is contaminated with heavy organics, such as weathered fuel oil, mixtures of petroleum-based fluids, diesel oil, and other solvents. (secs.sg)
  • Other major sources of VOCs include business activities using organic solvents. (sligococo.ie)
  • European Union (Installations and Activities using Organic Solvents) Regulations 2012 (S.I. No. 565 of 2012) (PDF) - 137 kbs - Dry Cleaners and other companies using solvents in their manufacturing or cleaning processes. (sligococo.ie)
  • VOCs serve a wide range of purposes including as solvents and refrigerants. (solomoncolors.com)
  • The prevalence of disinfection by-products in drinking water supplies has raised concerns about possible adverse health effects from chronic exposure to these potentially carcinogenic compounds. (cdc.gov)
  • How can I avoid exposure to VOCs? (healthlinkbc.ca)
  • You can best avoid exposure by controlling the source of the VOCs and using materials and products that do not give off VOCs. (healthlinkbc.ca)
  • If it is not possible to remove the source of VOCs, reduce exposure by sealing surfaces like particle board or paneling with an impermeable sealant, such as polyurethane varnish or latex paint. (healthlinkbc.ca)
  • Long-term exposure to some VOCs could lead to cancer and other chronic diseases. (plushbeds.com)
  • It's a good idea to limit your exposure to materials and products that contain VOCs, to protect your health. (plushbeds.com)
  • Exposure to volatile organic compounds (VOCs) has been an indoor environmental quality (IEQ) concern in schools and other buildings for many years. (mdpi.com)
  • This evaluation has been done in order to assess the occupational exposure to VOCs and to know the working conditions of the cleaners, but also to evaluate the effectiveness of personal protective equipment (PPE), the engineering control and the work practices. (upc.edu)
  • Well, this is it: Long-term exposure to some VOCs could lead to Cancer, Kidney, and Liver damage. (naturalmattressmatters.com)
  • However, the safety of a particular compound depends heavily on the person, the exposure and the frequency. (pcimag.com)
  • Those who have asthma or other chronic health problems have additional reasons to control their exposure to VOCs. (pcimag.com)
  • With this guide, households can better understand the health effects certain VOCs can have, common VOCs that they can find in their homes, where they might find them, and how they can limit their exposure. (pcimag.com)
  • Exposure tests have been performed up to the levels shown (in μg·m -3 ·min) and sampling rates are guaranteed to be linear up to the limit values and for overall concentration of volatile organic compounds in air not exceeding 2,000 μg·m -3 . (sigmaaldrich.com)
  • Long-term exposure to certain VOCs may lead to chronic diseases or cancer. (iaqa.org)
  • Outdoor, indoor, and personal exposure to VOCs in children. (thefreelibrary.com)
  • P [less than or equal to] H across the measured microenvironments the S and O environments had the smallest and H the largest influence on personal exposure to most compounds. (thefreelibrary.com)
  • Median and upper-bound H and P exposures were well above health benchmarks for several compounds, so outdoor measurements likely underestimate long-term health risks from children's exposure to these compounds. (thefreelibrary.com)
  • We use three separate formulated waters during product exposure: pH 5.0 and pH 10.0 (with 2 mg/L available chlorine for PE pipe and fittings) for extraction of metallic contaminants, and pH 8.0 for organic-based contaminants. (nsf.org)
  • Volatile organic compounds (VOCs) are gases that are given off by a number of indoor sources. (healthlinkbc.ca)
  • California's ARB uses the term "reactive organic gases" (ROG) to measure organic gases after public hearing in September 1995. (wikipedia.org)
  • Some building materials release gases called VOCs. (cdc.gov)
  • Volatile organic compounds, often abbreviated VOCs are emitted as gases from certain solids or liquids. (ecopurecincinnati.com)
  • These are gases and compounds composed of nitrogen and oxygen. (foobot.io)
  • Volatile organic compounds are gases released as materials age and degrade over time. (diynetwork.com)
  • The smell in a new car is perhaps one of the most noticeable examples of VOCs, as the interior plastics emit gases. (diynetwork.com)
  • The range comprises of hand-held and fixed photoionisation detection (PID) instruments with a detection range of ppb to 10,000 ppm for volatile organic compounds (VOC's) and other toxic gases. (theengineer.co.uk)
  • Volatile organic compounds, or VOCs, are organic compounds that can easily become vapors or gases. (wikipedia.org)
  • 1) Volatile Organic Compounds (VOCs), (2) Ozone and (3) Combustion related Air Contaminants (i.e. (coursera.org)
  • Soils contain various contaminants including metals and semi volatile organic contaminants (SVOCs). (epa.gov)
  • The contaminants include polychlorinated biphenyls (PCBs), pesticides, volatile organic compounds (VOCs), semiVOCs and heavy metals, and are present at levels of potential health concern. (wikipedia.org)
  • Office equipment such as printers, copiers, and fax machines may also emit VOCs. (ca.gov)
  • baby crib mattresses , cribs and changing tables do emit VOCs. (medium.com)
  • What products emit VOCs? (blogspot.com)
  • Although hardwood floors are easy to clean and might seem like a good solution, hardwoods include formaldehydes, and all finishes emit VOCs. (diynetwork.com)
  • Some plants and bacterial processes in soils emit VOCs. (nasa.gov)
  • Cribs made with natural, recycled or organic wood do not emit the toxins that are found in cribs that use traditional wood finishes. (wikihow.com)
  • Using an activated carbon (a carbon or charcoal that is very porous and has a large surface area) filter is likely the most reliable way to remove VOCs from the air. (ca.gov)
  • VOCs attach to and accumulate on the activated carbon in the process known as adsorption. (ca.gov)
  • It was found that VOCs were more sensitive to PM 2.5 on clean days than during periods of heavy particulate pollution. (springer.com)
  • In an air pollution context, also known as particulate matter or PM. Aerosols can be made of all sorts of compounds, and can have myriad health effects when they are breathed in or otherwise ingested. (chron.com)
  • The formation of gaseous and particulate secondary products caused by oxidation of VOCs is one of the largest unknowns in the quantitative prediction of the earth's climate on a regional and global scale, and on the understanding of local air quality. (wiley.com)
  • Volatile Organic Compounds in the Atmosphere describes the current state of knowledge of the chemistry of VOCs as well as the methods and techniques to analyse gaseous and particulate organic compounds in the atmosphere. (wiley.com)
  • VOCs evaporate into the air when these products are used or sometimes even when they are stored. (epa.gov)
  • Indoor levels can be 2 to as many as 1,000 times higher than outdoor VOCs. (plushbeds.com)
  • The indoor levels can kick off at 2 to 1,000 times higher than outdoor VOCs. (naturalmattressmatters.com)
  • U.S Environmental Protection Agency (EPA) studies have discovered that VOCs are widely found indoors. (plushbeds.com)
  • Indoors, VOCs are mostly released into the air from the use of products and materials containing VOCs. (ecospaints.net)
  • According to a study conducted by U.S Environmental Protection Agency (EPA) , volatile organic compounds typically originate indoors. (naturalmattressmatters.com)
  • Not all VOCs found indoors present harmful health effects to people and pets who live inside that home. (pcimag.com)
  • 1998). VOCs are also an indoor air quality issue because humans spend, on average, nearly 90% of their time indoors (Klepeis et al. (thefreelibrary.com)
  • Other sources of VOCs include the burning of fuels such as gas, wood and kerosene, as well as tobacco products. (healthlinkbc.ca)
  • In addition, due to their lower vapor pressure, SVOCs generally adsorb to different media (chamber walls, building materials, particles, and other surfaces) at greater rates than VOCs. (astm.org)
  • Harmful VOCs typically are not acutely toxic , but have compounding long-term health effects. (wikipedia.org)
  • The common insecticide fipronil and some of the compounds it degrades to are more toxic to aquatic insects, such as mayflies and stoneflies, than previously estimated, reports a new USGS study . (usgs.gov)
  • Are Volatile Organic Compounds VOCs in your Mattress Toxic? (naturalmattressmatters.com)
  • Many smells that come from products for the home contain volatile organic compounds, or VOCs. (pcimag.com)
  • Chlorobenzene is an aromatic organic compound with the chemical formula C6H5Cl. (waterfiltercomparisons.com)
  • Dechapanya W, Eusebi A, Kimura Y, Allen DT (2003a) Secondary organic aerosol formation from aromatic precursors. (springer.com)
  • Substances with high vapor pressure at room temperature are said to be volatile. (ca.gov)
  • VOCs) are compounds that vaporize (become a gas) at room temperature. (medium.com)
  • In other words, compounds strongly adsorbed at room temperature will be only partially recovered by thermal desorption. (sigmaaldrich.com)
  • On the other hand, compounds that are easily desorbed by heating will be sampled at room temperature with low efficiency. (sigmaaldrich.com)
  • VOCs are carbon-containing compounds that easily evaporate at room temperature. (ftc.gov)
  • Individual integration analysis and real time monitoring can be used to qualitatively and quantitatively analyze VOCs in the atmosphere and in indoor environments and determine the variation in total VOC (TVOC) concentration with time, respectively. (mdpi.com)
  • This enabled qualitative and quantitative analysis of VOCs when the TVOC concentration was high. (mdpi.com)
  • The highest concentration of VOCs was in April (22.21×10 -9 ), and the lowest in July (12.39×10 -9 ). (nih.gov)
  • Diurnal values of VOCs concentration had no obvious variations. (nih.gov)
  • Measurements of atmospheric acetone concentration from samples collected by the Trace Organic Gas Analyzer (TOGA) during ATom-3 flights in 2017. (ornl.gov)
  • The concentration of 92 compounds was measured in the end-tidal breath of 65 cases and 102 controls. (biomedcentral.com)
  • Pancreatic cancer is able to alter the concentration of some molecules in the blood and hence of VOCs in the alveolar air in equilibrium. (biomedcentral.com)
  • This is when the concentration of VOCs is the most important. (medium.com)
  • When in contact with a solid adsorbing medium, a gaseous compound will be adsorbed following the Freundlich isotherm, that is to say the adsorbed mass will be x/m=kC 1/n , where x is the mass of gaseous compound adsorbed by the mass m of the solid adsorbent and C is the concentration of the gaseous compound at the equilibrium in the gas phase. (sigmaaldrich.com)
  • At high temperatures, the adsorbent mass is very low whatever the concentration in the gas phase: this allows the recovery of adsorbed compounds by heating (see the curve at 300 °C). (sigmaaldrich.com)
  • Thermal degradation of such compounds will cause an underestimation of their concentration or the appearance of ghost peaks. (sigmaaldrich.com)
  • Lung cancer patients present a changed pattern of concentration for many volatile compounds. (biomedcentral.com)
  • This would allow a direct comparison of compounds released (or consumed) by cancer cells and the concentration patterns of volatile compounds in one and the same patient. (biomedcentral.com)
  • These constituents are nitrogen oxides and volatile organic compounds, and they have both natural and industrial sources. (nasa.gov)
  • The efficiency of ozone formation rises and then falls as the ratio of nitrogen oxides (NO x ) to volatile organic compounds (VOCs) increases in an idealized plot. (nasa.gov)
  • Is There a Safe Level of VOCs? (plushbeds.com)
  • If you're worried about the level of VOCs in your mattress, try buying an organic latex mattress instead. (plushbeds.com)
  • If you have even the slightest worry about the level of VOCs in your mattress, again the answer is really simple, switch to natural latex mattress immediately. (naturalmattressmatters.com)
  • However, there is a huge range of possible solids and liquids that may release VOCs as part of a natural process or simply due to their manufacture. (pcimag.com)
  • In the case of most common VOCs, they are liquids that evaporate rapidly at ambient temperatures. (solomoncolors.com)
  • Volatile organic compounds (VOCs ) in the experimental condition of Japanese cedar essential oil were collected using PEJ-02 tubes (Sigma-Aldrich, St. Louis, MO, USA) maintained at 22.5 ± 0.2 °C by applying a flow rate of 0.1 L/min. (bioz.com)
  • The effects of pure volatile organic compounds (VOCs ) (Sigma-Aldrich) were tested by spotting up to 100 ppm onto a filter paper contained within a 5-mm plastic vessel and placing the vessel on the agar surface. (bioz.com)
  • In order to get comparable results to measurements in soil, passive sampling of volatile organic compounds was performed by exposing SPME-fiber (Carboxen/polydimethylsiloxane, Supelco/Sigma-Aldrich, Taufkirchen, Germany) for 1 hour to sample air in the PET bags without any forced air movement. (bioz.com)
  • Then air samples from the headspace of the culture vessel were collected and preconcentrated by adsorption on solid sorbents with subsequent thermodesorption and analysis by means of gas chromatography mass spectrometry (GC-MS). Identification of altogether 60 compounds in GCMS measurement was done not only by spectral library match, but also by determination of retention times established with calibration mixtures of the respective pure compounds. (biomedcentral.com)
  • New methods have been introduced to increase the time resolution of those measurements and to resolve more complex mixtures of organic compounds. (wiley.com)
  • Composition and Atmospheric Reactivity of Ambient Volatile Organic Compounds(VOCs)in the Urban Area of Nanjing, China]. (nih.gov)
  • The atmospheric activity of VOCs was higher in the winter and spring than in the summer and autumn. (nih.gov)
  • Atkinson R (2000) Atmospheric chemistry of VOCs and NO x . (springer.com)
  • The European Union defines a VOC as "any organic compound having an initial boiling point less than or equal to 250 °C (482 °F) measured at a standard atmospheric pressure of 101.3 kPa. (wikipedia.org)
  • VOC means any compound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates and ammonium carbonate, which participates in atmospheric photochemical reactions, except those designated by EPA as having negligible photochemical reactivity. (ecospaints.net)
  • VOCs are organic chemical compounds whose composition makes it possible for them to evaporate under normal indoor atmospheric conditions of temperature and pressure. (ecospaints.net)
  • The definitions of VOCs used for control of precursors of photochemical smog used by the U.S. Environmental Protection Agency (EPA) and state agencies in the US with independent outdoor air pollution regulations include exemptions for VOCs that are determined to be non-reactive, or of low-reactivity in the smog formation process. (wikipedia.org)
  • Not only is it one of the most common, but methyl chloride is prone to photochemical reactions, making it extremely volatile and dangerous. (foobot.io)
  • Volatile organic compounds (VOCs) have been recognized as a primary source of air pollution, and are known photochemical reaction precursors which facilitate the production of tropospheric, or ground-level, ozone. (perkinelmer.com)
  • After they are absorbed in the body, VOCs are rapidly eliminated in exhaled breath, or may be rapidly metabolized and eliminated in the urine. (cdc.gov)
  • VOCs can also come from personal care products such as perfume and hair spray, cleaning agents, dry cleaning fluid, paints, lacquers, varnishes, hobby supplies, and from copying and printing machines. (healthlinkbc.ca)
  • Household paints are full of volatile organic compounds, also known as VOCs. (medicinenet.com)
  • Organic substances were used to color paints. (oldhouseweb.com)
  • For concrete coatings, sealers, paints, etc, VOCs most often serve as a carrier for other materials such as acrylics or pigments. (solomoncolors.com)
  • Once in the saturated zone, some highly soluble VOCs, such as the gasoline additive MTBE, move with the groundwater, whereas other VOCs, like carbon tetrachloride, are slowed when they adhere to organic carbon in the aquifer solids. (usgs.gov)
  • Some VOCs are degraded by bacteria in the aquifer, but others resist degradation and can be transported very long distances, in some cases reaching drinking-water supply wells . (usgs.gov)
  • THMs form when chlorine interacts with dissolved organic matter in water, which can happen when chlorine is added to drinking water for disinfection of bacteria. (usgs.gov)
  • To shed light on underlying disease mechanisms in pIBD and other common conditionse will use existing KEGG databases to determine the source of faecal VOCs identified by GCMS, which will include bacteria, fungi, host tissues and metabolism (http://www.genome.jp/kegg/kegg2.html). (clinicaltrials.gov)
  • Online gas chromatography with flame ionization detection (GC-FID) systems were employed to observe 56 species of volatile organic compounds (VOCs) in the environmental atmosphere in Nanjing in 2015. (nih.gov)
  • the short-lived hydroxyl radical, important for reacting with numerous compounds in the atmosphere. (chron.com)
  • Every day, large quantities of volatile organic compounds (VOCs) are emitted into the atmosphere from both anthropogenic and natural sources. (wiley.com)
  • To be able to model and control their impact, it is essential to understand the sources of VOCs, their distribution in the atmosphere and the chemical transformations which remove these compounds from the atmosphere. (wiley.com)
  • In recent years techniques for the analysis of organic compounds in the atmosphere have been developed to increase the spectrum of detectable compounds and their detection limits. (wiley.com)
  • The federal regulations issued under the Safe Drinking Water Act set maximum contaminant level standards for several organic compounds in public water systems . (wikipedia.org)
  • Because VOCs are very soluble, they are discussed as a contaminant in ground water. (usgs.gov)
  • Volatile organic compounds (VOCs) such as hydrocarbons. (nasa.gov)
  • TCE and PCE are examples of VOCs. (cdc.gov)
  • Present in molded plastics and coatings such as furniture polish, this is a volatile organic compound that can be found in nearly everything. (foobot.io)
  • Gasoline compounds and additives are another class of VOCs that is sometimes detected in groundwater. (usgs.gov)
  • Leaking underground gasoline storage tanks are a common, but unseen, source of gasoline VOCs to groundwater. (usgs.gov)
  • Disinfection by-products (DBP), including: bromodichloromethane, dibromochloromethane, bromoform, and chloroform, are formed when chlorine interacts with natural organic materials found in water. (cdc.gov)
  • After the opening conference, air samples were collected at the "V" Street facility for VOCs, CO, O 3 , and chlorine (Cl 2 ) [Cl 2 is found in cleaning solutions, and may be found in the mail processing facilities as a result of cleaning or disinfecting]. (cdc.gov)
  • A family of chemical compounds consisting of carbon, fluorine, and chlorine. (encyclopedia.com)
  • Their high vapor pressure results from a low boiling point , which causes large numbers of molecules to evaporate or sublimate from the liquid or solid form of the compound and enter the surrounding air, a trait known as volatility . (wikipedia.org)
  • Volatile organic compounds irritate the eyes, nose and throat, and cause headaches, nausea, and damage to the liver, kidneys and central nervous system. (epa.gov)
  • VOCs may cause eye, nose and throat irriation in the short term, and cancer, liver damage, kidney damage, and nervous system problems in the long term. (greenamerica.org)
  • Many VOCs are irritants and can cause headaches, eye, nose and throat irritation and dizziness. (iaqa.org)
  • The hydroxyl radical (·OH) loss rate( L ·OH ) and ozone formation potential(OFP)were applied to assess the chemical reactivity of VOCs. (nih.gov)
  • The ARB revised the definition of "Volatile Organic Compounds" used in the consumer products regulations, based on their committee's findings. (wikipedia.org)
  • VOCVOCDescriptionThe StarVOC HRVOC analyzer provides automatic, on-line analysisof total or speciated volatile organic compounds for compliance withEPA and local emission regulations. (environmental-expert.com)
  • These man-made VOCs are what regulations are most concerned with. (solomoncolors.com)
  • The People's Republic of China defines a VOC as those compounds that have "originated from automobiles, industrial production and civilian use, burning of all types of fuels, storage and transportation of oils, fitment finish, coating for furniture and machines, cooking oil fume and fine particles (PM 2.5)," and similar sources. (wikipedia.org)
  • Some VOCs are harmful to human health, whereas others can be used to determine the shelf-life of foods samples. (selectscience.net)
  • Look for products that do not use these this harmful chemical to keep vocs emission low. (foobot.io)
  • Under settlements with the Federal Trade Commission, three mattress manufacturers have agreed to stop making unsupported claims that the mattresses they sell are free of harmful volatile organic compounds (VOCs). (ftc.gov)
  • Some VOCs can be harmful to human health and the environment. (ftc.gov)
  • VOCs participate in ozone formation. (nasa.gov)
  • Ozone formation in the troposphere requires both NO x and VOCs. (nasa.gov)
  • a class of volatile organic compounds including ethene (ethylene) and propene (propylene) that is particularly capable of contributing to ozone formation. (chron.com)
  • Some VOCs are suspected to cause cancer in humans and have been shown to cause cancer in animals. (healthlinkbc.ca)
  • Some organics can cause cancer in animals, some are suspected or known to cause cancer in humans. (ecospaints.net)
  • Many organic compounds have been directly linked to cancer in animal studies and are known or suspected human carcinogens. (blogspot.com)
  • VOCs can cause allergic reactions such as asthma, headaches, upper respiratory infections, rashesm even cancer. (diynetwork.com)
  • The aim of this work was to confirm the existence of volatile organic compounds (VOCs) specifically released or consumed by lung cancer cells. (biomedcentral.com)
  • Our findings demonstrate that certain volatile compounds can be cancer-cell derived and thus indicative of the presence of a tumor, whereas other compounds are not released but seem to be consumed by CALU-1 cells. (biomedcentral.com)
  • A particularly ambitious goal is a better understanding of the biochemical background of endogenous compounds appearing in exhaled breath, both for healthy persons and persons suffering from certain diseases like cancer. (biomedcentral.com)
  • In the present contribution, we turn towards compounds appearing in exhaled breath of cancer patients. (biomedcentral.com)
  • For future cancer screening efforts it will be critical to know which of these compounds are effectively produced (or consumed) by cancer cells in the body. (biomedcentral.com)
  • Some of these VOCs are known carcinogens-meaning they have been linked with cancer. (medicinenet.com)
  • Chen X, Hopke PK, Carter WPL (2011) Secondary organic aerosol from ozonolysis of biogenic volatile organic compounds: chamber studies of particle and reactive oxygen species formation. (springer.com)
  • Methylene chloride, perchloroethylene, and trichloroethene are other VOCs that were widely used in the past. (cdc.gov)
  • Although grapevine resistance mechanisms against downy mildew have been widely characterized in resistant genotypes (1), the possible contribution of volatile organic compounds (VOCs) was not yet investigated. (fmach.it)
  • An J, Zhu B, Wang H, Li Y, Lin X, Yang H (2014) Characteristics and source apportionment of VOCs measured in an industrial area of Nanjing, Yangtze River Delta, China. (springer.com)
  • emission of volatile organic compoundsreducing the emission of volatile organic compounds (voc) is gaining importance. (environmental-expert.com)
  • Among the most serious concerns in indoor air quality are Volatile Organic Compounds. (blogspot.com)
  • In addition to drinking water, VOCs are regulated in pollutant discharges to surface waters (both directly and via sewage treatment plants), [12] as hazardous waste, [13] but not in non-industrial indoor air. (wikipedia.org)
  • There may be anywhere from 50 to hundreds of individual VOCs in the indoor air at any one time. (iaqa.org)
  • Testing for VOCs and indoor air pollution isn't cheap, with many of the available kits costing $50 to $150, so you may not want to lay out the money for blind testing. (feedster.com)
  • de Gouw JA, Middlebrook AM, Warneke C, Ahmadov R, Atlas EL, Bahreini R (2011) Organic aerosol formation downwind from the Deepwater Horizon oil spill. (springer.com)
  • They are not as highly reactive as alkenes, but they can be important for ozone and organic aerosol formation. (chron.com)
  • They include both human-made and naturally occurring chemical compounds. (wikipedia.org)
  • Performance requirements include a limit for the total VOCs measured, with specific upper thresholds for VOCs which are considered to be of concern. (ecospaints.net)
  • Compounds associated with consumer product use include p-dichlorobenzene (moth cakes, room air fresheners, toilet bowl deodorizers), chloroform (chlorinated water), and the fragrances [alpha]- and [beta]-pinene and d-limonene (cleaning products, room fresheners) (Wallace 1991a, 1991b). (thefreelibrary.com)
  • Indoor and outdoor VOC samples were collected and analyzed by thermal desorption, gas chromatography and mass spectroscopy for 94 compounds. (mdpi.com)
  • To better understand the characterization and secondary organic aerosol (SOA) formation of volatile organic compounds (VOCs) during non-haze and haze days, ambient VOCs were continuously measured by a vehicle-mounted online thermal desorption system coupled with a gas chromatography-mass spectrometry (TD-GC/MS) system in Shanghai, China. (springer.com)
  • Volatile organic compounds are trapped by adsorption and recovered by thermal desorption, analysis is performed by capillary gas chromatography and FID or MS detection. (sigmaaldrich.com)
  • Use of thermal desorption requires therefore an accurate preliminary investigation about the adsorbed compound - adsorbing medium pair. (sigmaaldrich.com)
  • 2001). VOCs in ambient air largely originate from mobile and industrial sources. (thefreelibrary.com)