• 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)
  • Aand along with 2,5-dimethylfuran, these VOCs are usually detected in the blood of cigarette smokers at higher levels than in non-smokers. (cdc.gov)
  • Volatile organic compounds (VOCs) are organic compounds that have a high vapor pressure at room temperature. (wikipedia.org)
  • Health Canada classifies VOCs as organic compounds that have boiling points roughly in the range of 50 to 250 °C (122 to 482 °F). The emphasis is placed on commonly encountered VOCs that would have an effect on air quality. (wikipedia.org)
  • The VOC Solvents Emissions Directive was the main policy instrument for the reduction of industrial emissions of volatile organic compounds (VOCs) in the European Union. (wikipedia.org)
  • Volatile organic compounds (VOCs) off-gassing from synthetic materials, nitrogen dioxide and harmful outdoor VOCs such benzene, toluene, ethyl-benzene and xylene penetrate into the indoor environment through ventilation and are the main contributors to poor indoor air quality with health effects. (springer.com)
  • Berzelius also contended that compounds could be distinguished by whether they required any organisms in their synthesis (organic compounds) or whether they did not ( inorganic compounds ). (wikipedia.org)
  • [6] Vitalism taught that formation of these "organic" compounds were fundamentally different from the "inorganic" compounds that could be obtained from the elements by chemical manipulations in laboratories. (wikipedia.org)
  • 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)
  • In chemistry , many authors consider an organic compound to be any chemical compound that contains carbon-hydrogen or carbon-carbon bonds , however, some authors consider an organic compound to be any chemical compound that contains carbon. (wikipedia.org)
  • The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry . (wikipedia.org)
  • Additionally, quantum-chemistry-based COSMO therm calculations were performed to estimate the p sat values of the studied compounds. (copernicus.org)
  • Liquid density of different kinds of organic sulfur compounds with varying carbon number (20°C/68°F). Comparison of thiols, sulfides, disulfides and thiophenes. (engineeringtoolbox.com)
  • Tables and figures below show the liquid density at 20°C for different groups of organic sulfur compounds , compared to other kinds of organic classes as alkanes, alcohols, acids and amines . (engineeringtoolbox.com)
  • Also, examples of the structures of the sulfur compounds thiols, dialkyl sulfides, methylalkyl sulfides, ethyl alkyl sulfides, isopropyl alkyl sulfides, diisoalkyl sulfides, dialkyl disulfides and alkylthiophenes are shown in the table below. (engineeringtoolbox.com)
  • The role of volatile sulfur compounds (VSCs) in producing bacteria that colonize the dorsal surface of the tongue was recently understood as a primary cause of halitosis (bad breath). (medscape.com)
  • Blood-borne causes often are consequences of metabolic processes that emit odorous volatile sulfur compounds, which are taken by the bloodstream, transported to the lungs, and emitted during exhalation. (medscape.com)
  • He and coworkers established that oral malodor (bad breath) is associated with the presence of volatile sulfur compounds, primarily hydrogen sulfide and methylmercaptan. (medscape.com)
  • Attempt was made to study organic selenium compounds of the heterocyclic series in reference to those properties leading to tinctorial and pharmaceutical possibilities. (gutenberg.org)
  • b) Some new heterocyclic compounds of selenium were studied and their characteristic properties more closely examined along the desired line. (gutenberg.org)
  • A heterocyclic compound with the formula C 4 H 4 S. Consisting of a stable, flat five-membered ring. (engineeringtoolbox.com)
  • An organic compound consisting entirely of hydrogen and carbon. (engineeringtoolbox.com)
  • For historical reasons, a few classes of carbon-containing compounds (e.g., carbonate salts and cyanide salts ), along with a few other exceptions (e.g., carbon dioxide , and even hydrogen cyanide despite the fact it contains a carbon-hydrogen bond), are generally considered inorganic . (wikipedia.org)
  • Living things incorporate inorganic carbon compounds into organic compounds through a network of processes ( the carbon cycle ) that begins with the conversion of carbon dioxide and a hydrogen source like water into simple sugars and other organic molecules by autotrophic organisms using light ( photosynthesis ) or other sources of energy. (wikipedia.org)
  • a) Organic selenium compounds were reviewed and their properties examined critically with those of allied compounds. (gutenberg.org)
  • The literature was reviewed and classified with reference to the properties under consideration, and new selenium organic compounds were prepared and studied which it is hoped may throw some additional light upon the problem. (gutenberg.org)
  • c) Selenium, in the nucleus of cyclic compounds, has been shown to be instrumental for a positive coloration at least equal to the -NH- or -S- groupings. (gutenberg.org)
  • No attempt has ever been made to compile a bibliography of selenium organic compounds. (gutenberg.org)
  • In the perusal of the organic records of the metal, distributed over the span of a century, there are indications of the value of selenium compounds for pharmaceutical and tinctorial uses. (gutenberg.org)
  • The CARB revised the definition of "Volatile Organic Compounds" used in their consumer products regulations, based on the committee's findings. (wikipedia.org)
  • The definition of " organic " versus " inorganic ", and whether some other carbon-containing compounds are organic or inorganic vary from author to author, and are topics of debate. (wikipedia.org)
  • Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive. (wikipedia.org)
  • The title compound, C 34 H 42 N 2 O 9 S 4 , is composed of two thio-phene rings bridged by an -O-(CH 2 ) 2 -O-(CH 2 ) 2 -O- chain and a tri-substitued diamine with pendent tosyl rings. (iucr.org)
  • The Project Gutenberg eBook of Synthesis of 2-methyl-4-selenoquinazolone 2-phenylbenzoselenazole, and Its Derivatives, by Y -Gwan Chen, M. A. (gutenberg.org)
  • The Project Gutenberg EBook of Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives, by Y -Gwan Chen This eBook is for the use of anyone anywhere in the United States and most other parts of the world at no cost and with almost no restrictions whatsoever. (gutenberg.org)
  • COSMO therm predicted the p sat values for most of the studied compounds within 1 order of magnitude difference between the experimental and computational estimates. (copernicus.org)
  • Saturation vapor pressure ( p sat ) is an important thermodynamic property regulating the gas-to-particle partitioning of organic compounds in the atmosphere. (copernicus.org)
  • The volatility of an organic compound can be quantified by its saturation vapor pressure ( p sat ) which is the key thermodynamic property describing the equilibrium gas-particle partitioning of the compound (Pankow, 1994). (copernicus.org)
  • For commercial metalworking fluid (MWF) droplets, compounds having low molecular weight were more prevalent in the vapor phase than those compounds with high molecular weight. (cdc.gov)
  • The wall losses of hexadecane and bis(2-ethylhexyl) sebacate (BEHS) were 0.25% and 26.5% of combined vapor and particle concentrations in the SADS sampling, respectively. (cdc.gov)
  • 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)
  • this has seen reduction in SO 2 emissions across Europe by more than 60% between 1990 and 2004 (Vestreng et al. (springer.com)
  • A fire, involving organic substances, releases both heat and smoke. (springer.com)
  • Different forms ( allotropes ) of pure carbon, such as diamond , graphite , fullerenes , and carbon nanotubes [4] are also excluded because they are simple substances composed of only a single element and therefore are not generally considered to be chemical compounds . (wikipedia.org)
  • Vitalism was a widespread conception that substances found in organic nature are formed from the chemical elements by the action of a "vital force" or "life-force" ( vis vitalis ) that only living organisms possess. (wikipedia.org)
  • Low-volatility organic compounds (LVOCs), with sufficiently low p sat values, primarily stay in the particle phase and contribute to aerosol formation. (copernicus.org)
  • Secondary organic aerosol (SOA) particles account for 64 % to 95 % of submicron organic aerosol particles measured at different locations, from urban to remote areas (Zhang et al. (copernicus.org)
  • The organic and inorganic composition of saliva can supply information about alterations in enzymatic activity in response to periodontal inflammation (3). (bvsalud.org)
  • Most synthetically-produced organic compounds are ultimately derived from petrochemicals consisting mainly of hydrocarbons , which are themselves formed from the high pressure and temperature degradation of organic matter underground over geological timescales. (wikipedia.org)
  • We were advised that the NIOSH recommended standard for occupational exposure to arsenic does not distinguish between organic and inorganic arsenic and recommends a standard of 0.002 mg (As)/m(3). (cdc.gov)
  • However, it is more and more recognized that there is also a need to assess the environmental impact of toxic compounds within fire effluents. (springer.com)
  • Progress in the field of ecotoxicological studies is important because long-term exposure from the environment and bioaccumulation of toxic compounds in the human food chain may cause indirect health effects on humans. (springer.com)
  • B. No owner or other person shall sell, supply, offer for sale, or manufacture for sale an antiperspirant or a deodorant that contains a compound that has been defined as a toxic pollutant in 9VAC5-60-210 C. (virginia.gov)
  • Depending on the fire's specific conditions, many diverse chemical compounds are produced in varying amounts. (springer.com)
  • Several reviews (2) of its compounds, including references, have been published, besides the resumes in the chemical dictionaries. (gutenberg.org)
  • Now a research group lead by Evandro Castaldelli at the University of Sao Paulo, Brazil, in collaboration with researchers in the UK and France, have identified another class of chemical compound, the more exotic metal-organic frameworks (MOFs) as promising for application in electronic devices. (ieee.org)
  • A role played by a chemical compound which is known to induce a process of carcinogenesis by corrupting normal cellular pathways, leading to the acquistion of tumoral capabilities. (ebi.ac.uk)
  • An organosulfur compound that contains a carbon-bonded sulfhydryl group (-SH), with the general formula R-SH (where R represents an alkyl or other organic substituent). (engineeringtoolbox.com)
  • In a 2-thiol and a 3-thiol the -SH group is located at the second and third carbon atom in the alkyl chain, respectively. (engineeringtoolbox.com)
  • An organic compound of the form R'-S-R'' (where R' and R'' represents an alkyl or other organic substituent). (engineeringtoolbox.com)
  • It can be a primary (R-NH2), a secondary (R',R''-NH) or a tertiary amine (R',R'',R'''-N), where R represent an alkyl or other organic substituent. (engineeringtoolbox.com)
  • A. Except as provided in 9VAC5-45-410 , 9VAC5-45-440 , and 9VAC5-45-450 , no owner or other person shall (i) sell, supply, or offer for sale a consumer product manufactured on or after August 1, 2010, or (ii) manufacture for sale a consumer product on or after August 1, 2010, that contains volatile organic compounds in excess of the limits specified in Table 45-4A. (virginia.gov)
  • It first came under question in 1824, when Friedrich Wöhler synthesized oxalic acid , a compound known to occur only in living organisms, from cyanogen . (wikipedia.org)
  • A primary arylamine that is aniline in which the hydrogens at the 2- and 6-positions are replaced by methyl groups. (ebi.ac.uk)
  • The acute toxicity of these compounds is generally low and may not pose a direct health hazard during exposure [ 2 ]. (springer.com)
  • In addition, fire effluents contain soot particles (particulate matter [PM]) that can penetrate deep into the lungs while carrying other, less mobile compounds. (springer.com)
  • The combustion of organic materials, particularly if it is incomplete, may also give rise to more complex molecules in the smoke plume, which may typically include longer carbon chains and multiple carbon-rings. (springer.com)
  • The density is shown as function of carbon number in the organic compounds. (engineeringtoolbox.com)
  • Due to carbon's ability to catenate (form chains with other carbon atoms ), millions of organic compounds are known. (wikipedia.org)
  • They inherit the properties of the various compounds that make them up. (ieee.org)
  • Although organic compounds make up only a small percentage of Earth's crust , they are of central importance because all known life is based on organic compounds. (wikipedia.org)
  • 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)
  • Disinfection by-products (DBP), including: bromodichloromethane, dibromochloromethane, bromoform, and chloroform, are formed when chlorine interacts with natural organic materials found in water. (cdc.gov)
  • Volatile organic compounds that are classified as hazardous materials are regulated by the Pipeline and Hazardous Materials Safety Administration while being transported. (wikipedia.org)
  • More than two decades ago, organic polymers entered the electronic world, leading to semiconducting organic materials that found applications such as RFID (radiofrequency identification) tags or flexible solar cells. (ieee.org)
  • To find the materials that might produce semiconducting properties, the researchers looked at existing organic materials used in current electronics and identified which materials caused the semiconducting properties. (ieee.org)
  • It is also important to note that the word "organic" in this context does not mean "natural. (wikipedia.org)
  • Study of the In Vitro Digestion of Olive Oil Enriched or Not with Antioxidant Phenolic Compounds. (mdpi.com)
  • Organic vapors with sufficiently low volatility can condense onto existing particles or form new particles (Hallquist et al. (copernicus.org)
  • Vials are stored under appropriate refrigerated (2-8°C) conditions until they are shipped to the National Center for Environmental Health, for testing. (cdc.gov)
  • CO 2 ), and cyanides are generally considered inorganic . (wikipedia.org)