Surface atmospheric concentrations of polycyclic aromatic hydrocarbons polycyclic hydrocarbons aromatic. Medical search. Frequent questions

Presence of polycyclic aromatic hydrocarbons (PAHs) in wastewater stream forms one of the current challenges facing wastewater treatment research [ 1 - 4 ]. (omicsonline.org)
In a refractory brick manufacturing company a qualitative and quantitative determination of the sources of occupational exposure to polycyclic aromatic hydrocarbons (PAHs) was obtained in order to validate targeted hygiene measurements. (bvsalud.org)
The study included the assessment of PAHs contamination of work surfaces by wipe-sampling, cutaneous exposure by hand washing, contamination of personal protective equipments (gloves) by extraction in solvent, and airborne PAHs concentration in atmospheric samples. (bvsalud.org)
The surface contamination sampling was performed in production, packaging, and in other departments (external area) in theory less contaminated by PAHs. (bvsalud.org)
Occurrence of polycyclic aromatic hydrocarbons (PAHs) in freshwater may aggravate the water crisis currently being experienced in the Western Cape Province of South Africa. (scielo.org.za)
Among the list of prioritised emerging micro-contaminants that have been identified to degrade water quality is the polycyclic aromatic hydrocarbons (PAHs) group (Christensen and Arora, 2007). (scielo.org.za)
The concentrations of different PAH fractions and the sum total of PAHs detected in different aquatic environment varies. (scielo.org.za)
varied concentrations of PAHs have also been measured elsewhere in the world (Zhang et al. (scielo.org.za)
Our focus is on four polycyclic aromatic hydrocarbons (PAHs) of largely varying properties. (copernicus.org)
Sediment cores from Lake Superior were collected, dated, and analyzed for a suite of hydrophobic organic contaminants (HOCs) including polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and n-alkanes. (umn.edu)
In particular, the model predicts a greater abundance of lower molecular weight PAHs in near-shore areas with higher total suspended material concentrations than in open waters. (umn.edu)
Differences in model results and measured surface accumulation rates and inventories of PAHs as well as carbon preference indices suggest that sediments from the western arm of Lake Superior are subject to local sources including uncombusted petroleum. (umn.edu)
Ocean stratification plays a crucial role in many biogeochemical processes of dissolved matter, but our understanding of its impact on widespread organic pollutants, such as polycyclic aromatic hydrocarbons (PAHs), remains limited. (researchgate.net)
Polycyclic aromatic hydrocarbons (PAHs) can disrupt important signaling pathways that transcribe genes during fish's early embryonic development, which could cause malformations. (gulfresearchinitiative.org)
Researchers measured polycyclic aromatic hydrocarbon (PAH) concentrations in water collected near the Deepwater Horizon site to understand how sinking particles, such as marine snow, influence the residence time of PAHs in the upper ocean. (gulfresearchinitiative.org)
Polycyclic aromatic hydrocarbons (PAHs) and their alkylated, nitrated and oxygenated derivatives in the atmosphere over the Mediterranean and Middle East seas, Atmospheric Chemistry and Physics, 22(13), 8739-8766, doi:10.5194/acp-22-8739-2022, 2022. (mpic.de)
16 polycyclic aromatic hydrocarbons (PAHs), 20 organochlorine pesticides (OCPs) and 12 polychlorinated biphenyls (PCBs) were analysed in each dated sediment layer using gas chromatography coupled with mass spectrometry or electron capture detector. (ubbcluj.ro)
The results show that, over the past 100 years, POP concentrations from sediment samples ranged from 2.53 to 156.27 ng/g for PAHs, from 1.78 to 71.12 ng/g for OCPs, and from not detected to 76.03 ng/g for PCBs. (ubbcluj.ro)
persistent organic pollutants (POPs) including selected polycyclic aromatic hydrocarbons (PAHs), dioxins and furans, polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB). (europa.eu)
An evaluation is presented of the 15 polycyclic aromatic hydrocarbons (PAHs) burden of the above-mentioned matrices. (vtei.cz)
In this case, 'taint' was due to the presence of the aromatic polycyclic aromatic hydrocarbons (PAHs) compounds (Yender, Michel, & Lord, 2002). (joe.org)

2023. Diffusive fluxes of persistent organic pollutants between Arctic atmosphere, surface waters and sediments. (nih.gov)

Model Evaluation of Indoor Exposure to Polychlorinated Dibenzo-p-Dioxins and Dibenzofurans and Polycyclic Aromatic Hydrocarbons from Household Fuel Combustion in Rural Areas of Tibetan Plateau, Exposure and health, 14, doi:10.1007/s12403-022-00482-4, 2022. (mpic.de)

The reduction in the flammability of polymeric materials and fire hazard resulting from their use consists in selecting properly the composition of polymeric blends, which can be achieved by using appropriately selected flame-retardant compounds and fillers or nano-fillers, surface modification of components or products. (akjournals.com)
With its high temporal resolution and the high degree of conserved chemical composition information, CHARON PTR-TOFMS is thus the perfect analytical technique to identify and quantitatively follow atmospheric particulate tracer compounds like levoglucosan and polycyclic aromatic hydrocarbons. (ionicon.com)
Some of these are volatile organic compounds, meaning they evaporate into the air, and others are non-volatile, meaning they adhere to the surface. (cdc.gov)
NIOSH research has shown that when combined with ozone, one of the common components of pine oil cleaners, alpha-terpineol, transforms into many oxygenated organic compounds in both the gas-phase and on surface reactions creating new products potentially harmful to those exposed. (cdc.gov)
Although dermal contact may also contribute describe the time course of plasma concentrations using the data to workplace exposure for certain compounds, the current from the route comparison study. (cdc.gov)

Some new features in input and physics parameterizations of tracers were tested: emission seasonality, the size discretization of particulate-phase tracers, the application of poly-parameter linear free-energy relationships in gas-particle partitioning, and re-volatilization from land and sea surfaces. (copernicus.org)
The model was validated against observations of PAH concentrations and aerosol particulate mass fraction. (copernicus.org)
Quantitatively detect sub-µm particulate organic matter in sub-ng m-³ mass concentrations in real-time with the new CHemical Analysis of aeRosol ON-line (CHARON) particle inlet coupled to your IONICON PTR-TOFMS instrument. (ionicon.com)
Is the oxidative potential of components of fine particulate matter surface-mediated? (mpic.de)
Particulate matter (PM) concentrations are significantly higher in urban railway tunnels (178.1 μg/m3) than in metropolitan areas (49 μg/m3). (annexpublishers.com)
New metrics to evaluate the relationship between particulate matter and health are also being considered, including particle number concentration, particle composition measures, and particle oxidative load. (cdc.gov)

The new submodel SVOC for the Modular Earth Submodel System (MESSy) was developed and applied within the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model to simulate the atmospheric cycling and air-surface exchange processes of semivolatile organic pollutants. (copernicus.org)
Polycyclic aromatic hydrocarbons (PAH) are ubiquitous pollutants resulting from incomplete combustion and hence normally unavoidable. (lsu.edu)
By increasing the surface-to-volume ratio of a thin film by a factor of five, the formation rate of 9 H -fluorene-9-ol, 9 H -fluorene-9-one and 6 H -dibenzo[ b , d ]pyran-6-ol was significantly enhanced, highlighting the importance of interfacial degradation of organic pollutants on hydrometeors with large surface-to-volume ratio, such as fog. (lsu.edu)
This is particularly true when it comes to atmosphere-surface exchangeable pollutants (ASEPs). (mtu.edu)

While historical monitoring has reported low concentrations of heavy metals over the past decade (2010-2020), the presence of carcinogenic polycyclic aromatic hydrocarbons (cPAHs) in Mytilus tissues should be considered by recreational and subsistence consumers. (wikipedia.org)
2020. Treatment of Polycyclic Aromatic Hydrocarbons in Oil Sands Process Affected Water with a Surface Flow Treatment Wetland . (sfu.ca)
From October 2020 to September 2021, in two forest micro-catchments in the Czech Republic, the quality of wet atmospheric deposition (bulk and throughfall) was monitored simultaneously with the surface water quality in the local watercourse, humus, and the moss species Pleurozium schreberi. (vtei.cz)

Atmospheric Hydroxyl Radical Reaction Rate Coefficient and Total Environmental Lifetime of α-Endosulfan, Environmental Science & Technology, 57(42), 15999-16005, doi:10.1021/acs.est.3c06009, 2023. (mpic.de)
2023. Methods for Assessing the Bioaccumulation of Hydrocarbons and Related Substances in Terrestrial Organisms: A Critical Review . (sfu.ca)
2023. The atmospheric fate of 1,2-Dibromo-1 4-(1,2-dibromoethyl)cyclohexane (TBECH): Spatial patterns, seasonal variability, and deposition to Canadian coastal regions . (sfu.ca)

A&WMA International Conference on Aerosol and Atmospheric Optics: Visibility and Air Pollution (2012). (lbl.gov)

Atmospheric deposition as a possible source of surface water pollution (Results of the project, part 2. (vtei.cz)

This finding may have important implications for gas-particle and gas-film partitioning, transport, and photolytic degradation of atmospheric PBDEs. (deu.edu.tr)
Most studies address PAH degradation in the bulk-water phase, neglecting the fact that the most significant contribution to their environmental degradation takes place in aerosols, especially for volatile PAH (2-4 aromatic rings). (lsu.edu)
Analytical artifacts, which may result by reactions on such collection surfaces or thermal degradation at high desorption temperatures and residence times, are efficiently reduced. (ionicon.com)

Inter-comparison of oxidative potential metrics for airborne particles identifies differences between acellular chemical assays, Atmospheric Pollution Research, 13(12), doi:10.1016/j.apr.2022.101596, 2022. (mpic.de)
Corrigendum to "Three years of atmospheric concentrations of nitrated and oxygenated polycyclic aromatic hydrocarbons and oxygen heterocycles at a Central European background site" [Chemosphere 269 (2021) 128738], Chemosphere, 300, doi:10.1016/j.chemosphere.2022.134757, 2022. (mpic.de)
2022. Treatment of naphthenic acids in oil sands process-affected waters with a surface flow treatment wetland: mass removal, half-life, and toxicity-reduction . (sfu.ca)

2017 ) . The addition of a surface module aims to describe air-surface exchange processes and biogeochemical cycles of contaminants, whereas a chemistry module describes the changes in air concentrations due to phase partitioning and chemical transformations. (copernicus.org)
In 2017, 20 lamprey were collected off the Washington and Oregon coasts by the National Oceanic and Atmospheric Administration. (usgs.gov)

Individual exposures, however, can differ substantially from concentrations measured at central sites due to spatial variability across a region and sources unique to the individual, such as cooking or cleaning in homes, traffic emissions during commutes, and widely varying sources encountered at work. (cdc.gov)

Atmospheric Pollution Research 4 (2013) 398-404. (lbl.gov)

Particle impaction onto an adhesive surface (non-viable) or into culture media (viable) are the most widely used techniques to evaluate the presence and levels of airborne bioaerosols, particularly in non-industrial indoor environments. (environmental-expert.com)
To follow up this discovery and related future exoplanet biosignature detections, it is important to spectroscopically detect the presence of phosphorus-bearing atmospheric molecules that could be involved in the chemical networks producing, destroying or reacting with phosphine. (frontiersin.org)

In addition, environmental contaminants of the surface-water and Mytilus tissues at Illahee State Park are monitored routinely by local ecology programs. (wikipedia.org)
This review considers the use of filters to sample air in mining workplace environments for dust concentration measurement and subsequent analysis of hazardous contaminants, especially respirable crystalline silica (RCS) on filters compatible with wearable personal dust monitors (PDM). (cdc.gov)

Occupational exposure limits (OELs) are used by pharma- inhalation) and to compare the area under the plasma ceutical companies to provide guidance for acceptable levels of concentration versus time curve with similar data for the occupational exposure to the active pharmaceutical ingredients clinical route of exposure (e.g., po) on which the OEL is based. (cdc.gov)

Atmospheric Chemistry and Physics 22 (9), pp.6045-6066. (cardiff.ac.uk)

There is a group of polymers such as polyolefines, cellulose, and others that undergo complete combustion in a medium that is poorer in oxygen than atmospheric air. (akjournals.com)
The hetero-phase combustion consists in adsorbing oxygen on the material surface under combustion and flame-less oxidation at the interface. (akjournals.com)
The combustion according to the homo-phase mechanism results from the reaction between the volatile products of thermal decomposition and oxygen with no interfacial surface between reagents [ 1 , 2 ]. (akjournals.com)

This goal has been obtained by combining different inorganic and organic chemical proxies such as trace elements, polycyclic aromatic hydrocarbons, and lead isotope ratios and exploiting both principal component and factor analysis to associate chemical proxies to human-driven contamination processes. (springer.com)
Three short sediment cores have been exploited to this aim and characterized in terms of major and trace elements, polycyclic aromatic hydrocarbons, and lead isotope ratios. (springer.com)

PAH concentrations in Puget Sound have been highlighted by the National Oceanic and Atmospheric Administration as being the highest in the nation and cPAH regulatory thresholds for Washington State consumers have been calculated by the Washington State Department of Ecology. (wikipedia.org)
This possibility highlighted the need for quick predictions of oceanic flows and subsurface hydrocarbon distribution during and after a spill. (gulfresearchinitiative.org)
Rice the Program Manager for Habitat Assessment & Marine Chemistry at the Auke Bay Fisheries Laboratory of the National Oceanic and Atmospheric Administration's National Marine Fisheries Service in Juneau, Alaska. (sciencewatch.com)

The nature and mechanism of adsorption is primarily effective within porous solids however, the interactive forces of physical attraction between the surface of porous solids and the targeted components of the molecules in the bulk phase establish adsorption process [ 9 ]. (omicsonline.org)
Interior to this zone, many of the carbon-based molecules that are thought to be precursors to life, like polycyclic aromatic hydrocarbons, are destroyed. (bigthink.com)

The polycyclic aromatic hydrocarbon (PAH) content is relatively low for a petroleum product. (cedre.fr)

Once at atmospheric pressure at the base of the rig where the leak occurred, part of the substance expanded in the form of a gas into the atmosphere while part of it liquefied to form a liquid condensate comparable to gasoline. (cedre.fr)
The image is of a small cross-sectional area, note the small curvature of the surface, yet the atmosphere is a small part of the whole. (pressbooks.pub)
The atmosphere is composed of 78.08% nitrogen and 20.95% oxygen with small amounts of other gases: 0.93% argon, 0.038% carbon dioxide, 0.002% neon, and yet smaller concentrations of helium, methane, krypton, and hydrogen. (pressbooks.pub)

Looking closely, you can see tall thunderstorm clouds silhouetted against an orange layer of atmospheric gases backlit by the sun just below the horizon. (pressbooks.pub)

In this study, a novel approach of using a Fourier transform infrared spectrometer along with measurements of atmospheric turbulence is shown to present a practical, non-intrusive method of quantifying emission rates for ammonia, alkanes, and methane. (copernicus.org)

suburban concentrations) was similar to one observed for ambient air concentrations recently in Izmir, Turkey. (deu.edu.tr)
Air-organic film partitioning modeling results have suggested that organic films can be used in conjunction with the dynamic uptake model to approximate the gas-phase ambient air concentrations. (deu.edu.tr)

A background concentration is defined as the concentration of trace elements before industrialization, so its level should reflect natural processes uninfluenced by human activities (Tapia et al. (springer.com)

Once malathion is introduced into the environment, it is degraded by atmospheric photooxidation, hydrolysis, or biodegradation mediated by microorganisms found in most sediment, soils, and water. (cdc.gov)

Nitrogen oxide (NOx) concentrations, which are a direct cause of lung disease, have been found to exceed the atmospheric standard of the Ministry of Environment in tunnels in Korea. (annexpublishers.com)

Consumer products used in indoor environments for cleaning, surface finishing and deodorizing are typically mixtures of many chemicals. (cdc.gov)

Moreno-Castilla [ 12 ] reported that, there is complex interplay between electrostatic and non-electrostatic interactions while both are highly influenced by the surface chemistry of the carbon. (omicsonline.org)
Therefore, the PTR-MS technology we use allows for the detection of almost the full range of atmospheric organic carbon with one single instrument. (ionicon.com)

Two different areas were identified within the production, one included surfaces that were regularly cleaned (A area) and one included data from non-cleaned surfaces (B area). (bvsalud.org)
This data release includes sampling location, pesticide concentrations in passive samplers (silicone bands) and bees foraging in Conservation Reserve Program fields. (usgs.gov)
Fitting these data to a rate equation gives the rate of inactivation at this concentration of inhibitor. (aktsignals.com)
Citizen scientist Don Keith used to snowshoe across Eagle Harbor once a week to gather atmospheric data. (mtu.edu)

The results indicate that the predicted global distribution of the 3-ring PAH phenanthrene is sensitive to the seasonality of its emissions, followed by the effects of considering re-volatilization from surfaces. (copernicus.org)

Polybrominated diphenyl ether (PBDE) concentrations of outdoor and indoor organic films on window glasses were measured at different locations (offices, laboratories, and homes in urban, suburban, rural, and industrial sites) in Izmir, Turkey. (deu.edu.tr)

Response Surface Methodology was used to evaluate the interactions of carbonization temperatures of adsorbents and concentrations of adsorbates on the adsorption capacities and removal efficiencies of activated carbons obtained from flamboyant ( Delonix regia ) pod bark (FB), milk bush ( Thevetia peruviana ) kernel shell (MB) and rice ( Oryza sativa ) husks (RH). (omicsonline.org)
Two factors interaction (2FI) model Y = a 0 + a 1 A + a 2 B + a 12 AB, showed that the interactions between increasing activation temperature of the adsorbents and increasing concentrations of the adsorbates increased the adsorption capacity of the MB while the adsorption capacities of FB and RH were reduced. (omicsonline.org)

There is no need for off-line particle pre-concentration e.g. by collection/desorption on surfaces. (ionicon.com)

It was hypothesized that household tumble driers could be atmospheric sources of these microfibers. (researchgate.net)

Average total outdoor PBDE (Sigma 7PBDE) concentrations for suburban, urban, and industrial sites were 43.5, 45.5, and 206 ng m(-2), respectively. (deu.edu.tr)

Ehrenhauser, Franz Stefan, "Photochemical Reaction Products of Polycyclic Aromatic Hydrocarbons Adsorbed at an Air-Water Interface" (2011). (lsu.edu)
The recent emphasis on "natural" or "green" cleaning products has led to an increase in the use of terpenes (hydrocarbons produced by plants-particularly conifers) like alpha-pinene, limonene and delta-carene in cleaners and air fresheners. (cdc.gov)

A database of chemical elements' concentrations was obtained by analysing exposed lichens and bark, hung on courtyard trees of 22 Lisbon basic schools from January to May 2008 and June to October 2008 (winter and summer campaigns). (environmental-expert.com)

between 60% - 100% of the organic mass concentrations can be directly calculated without the need of any additional corrections. (ionicon.com)

In terms of public health protection, the most important indicator in surface water monitoring is microbial fecal contamination. (vtei.cz)
Evaluation of the very-low frequency, ultralow frequency, or extremely low frequency magnetic field (H-field) due to a buried or on-surface magnetic dipole or antenna is important for applications such as geophysical exploration and through-the-Earth (TTE) wireless communications. (cdc.gov)

Table 3) significantly affected RFS of HCC patients following LT. Effects of miR-20a restoration on HCC cell proliferation and cell cycles in vitro Cell proliferation is a GSK2245840 concentration key determinant of tumor malignancy. (aktsignals.com)
Recent studies have shown that even at concentrations below current EPA regulations health effects persist [6, 7]. (cdc.gov)

The highest concentrations measured in the industrial area were attributed to the significant PBDE emissions from several steel plants located in the area. (deu.edu.tr)
The Sensory Expert would crack open the lid of the dish and take three shallow sniffs of the headspace odor (headspace is that area between the surface of the fish and the lid of the dish) and immediately cover the dish. (joe.org)

The activated carbons produced at various temperatures (300-600 ?C) were used to adsorb concentrations (50-150 mg/L) of naphthalene and acenaphthene in a batch process at 150 rpm. (omicsonline.org)

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