• In this study, we assessed the levels of polycyclic aromatic hydrocarbons (PAHs) and their nitrated, hydroxylated, and oxygenated derivatives (i.e. (cdc.gov)
  • Secondary formation, however, contributed significantly to the derivatives of PAHs (especially NPAHs and OPAHs) in the nonheating season, suggesting significant impacts of atmospheric transformation on the toxicity of PM2.5. (cdc.gov)
  • 2016. A review on deposition of atmospheric PAHs and interaction with other environmental matrices and its source apportionment with respect to Indian scenario. (e-ijep.co.in)
  • 2011. Determination of polycyclic aromatic hydrocarbons (PAHs) in water and sediments of the Kor river, Iran. (e-ijep.co.in)
  • 2011. Proximal input of polynuclear aromatic hydrocarbons (PAHs) in groundwater sources of Okrika mainland, Nigeria. (e-ijep.co.in)
  • Polycyclic aromatic hydrocarbons (PAHs) have toxic impacts on humans and ecosystems. (oregonstate.edu)
  • One of the most carcinogenic PAHs, benzo(a)pyrene (BaP), is efficiently bound to and transported with atmospheric particles. (oregonstate.edu)
  • This study has profound implications demonstrating that OA strongly modulates the atmospheric persistence of PAHs and their cancer risks. (oregonstate.edu)
  • Primary emission sources make significant contributions to the atmospheric organic compounds and six groups (including n-alkanes, PAHs, levoglucosan, branched-alkanes, n-alkenes and alkyl-benzenes) account for 66% of total identified organic compound mass. (birmingham.ac.uk)
  • In addition, polycyclic aromatic hydrocarbons (PAHs), and oxygenated PAHs (OPAHs) were abundant amongst the atmospheric organic compounds on both haze and non-haze days. (birmingham.ac.uk)
  • Presence of polycyclic aromatic hydrocarbons (PAHs) in wastewater stream forms one of the current challenges facing wastewater treatment research [ 1 - 4 ]. (omicsonline.org)
  • Among the organic compounds, Polycyclic Aromatic Hydrocarbons (PAHs) have received special attention due to their high toxicity. (fapesp.br)
  • In contrast, during nighttime, an increase in the concentrations of alkanes, PAHs, alkane-2-ones, and anthropogenic metals such as Pb, Ni, and Cu was found due to variations in the boundary layer height. (copernicus.org)
  • The creosote process exposed people to polycyclic aromatic hydrocarbons (PAHs). (cdc.gov)
  • Highly oxygenated organic molecules with high unsaturation (HU-HOMs) are formed by the multigenerational photo-oxidation of large polycyclic aromatic hydrocarbons (PAHs) on soot. (mpic.de)
  • Distribution of Gas Phase Polycyclic Aromatic Hydrocarbons (Pahs) in Selected Indoor and Outdoor Air Samples of Malaysia: A Case Study in Serdang, Selangor and Bachang, Malacca. (ukm.my)
  • 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)
  • PAHs constitute a group of chemicals, which are formed during the incomplete combustion of coal, oil and gas, garbage, and other organic substances. (cdc.gov)
  • This method is used to assess human exposure to selected PAHs, a class of potential human carcinogens, by determining the concentrations of their mono-hydroxy metabolites in urine. (cdc.gov)
  • Our focus is on four polycyclic aromatic hydrocarbons (PAHs) of largely varying properties. (copernicus.org)
  • These samples were subjected to accelerated solvent extraction with a mixture of dichloromethane and acetone and separated into functional group fractions for analyses by GC/MS. Over 180 organic compounds belonging to three major fractions (n-alkanes, polycyclic aromatic hydrocarbons - PAHs, and polar organic compounds - POCs) were identified and quantified. (nottingham.edu.cn)
  • However, specimens collected during the summer 1997-98 showed enhanced concentration levels of PCBs and PAHs that could refer to a local anthropogenic source of contamination. (unive.it)
  • 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)
  • 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)
  • persistent organic pollutants (POPs) including selected polycyclic aromatic hydrocarbons (PAHs), dioxins and furans, polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB). (europa.eu)
  • One of the anthropogenic sources might be drainage waters, especially in a city where city dwellers use various aromatic compounds in different forms for their comfort. (e-ijep.co.in)
  • This study proves the utility of liquid-liquid extraction through longtime mechanical agitation in order to extract aromatic compounds from water of a city drainage basin. (e-ijep.co.in)
  • Gas chromatography mass spectrometry has shown that experimental water sample from various spots of waterbody contains a good number of identical aromatic compounds. (e-ijep.co.in)
  • C6) at a molecular level on non-haze and haze days, we determined more than 300 organic compounds in the PM2.5 from an urban area of Beijing in November-December 2016 using two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC × GC-TOFMS). (birmingham.ac.uk)
  • The identified organic compounds have been classified into groups, and quantitative methods were used to calculate their concentrations. (birmingham.ac.uk)
  • In addition, the concentrations of unidentified compounds were also estimated in the present study. (birmingham.ac.uk)
  • In addition, the CHARON particle inlet significantly extends the range of by PTR-MS measurable compounds from gas-phase volatile and intermediate volatile organics (VOC and IVOC) to particle-phase intermediate, semi and low volatile organic compounds (IVOC, SVOC and LVOC, respectively). (ionicon.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)
  • Biogenic organics contributed up to 7 % of the organic matter with high contributions from compounds such as heneicosane, hentriacontane, and nonacosane. (copernicus.org)
  • The wristbands were also found to be a simple approach to assess personal exposure to potentially toxic organic compounds. (kunakair.com)
  • An intensive field study was conducted in the urban atmosphere of Singapore to investigate the composition of organic compounds in both gaseous and particulate phases during the period of August to early November 2006. (nottingham.edu.cn)
  • The composition of these organic compounds fluctuated temporally with most of them being relatively higher in October than those in other months of the sampling period. (nottingham.edu.cn)
  • Microfibers of polyester and cotton might be significant for the transport and fate of chemical pollutants in the air due to the amounts emitted, as well as their capacities to sorb inorganic and organic compounds. (researchgate.net)
  • The National Emission reduction Commitments Directive sets national emission reduction commitments for Member States and the EU for five important air pollutants: nitrogen oxides (NOx), non-methane volatile organic compounds (NMVOCs), sulphur dioxide (SO2), ammonia (NH3) and fine particulate matter (PM2.5). (europa.eu)
  • There is probably no single one chemical exposure responsible for these illnesses, but more likely a mixed exposure of chemical classes such as particulate matter and oxygenated organic species (oxidized volatile organic compounds that are likely biologically reactive and potentially cause cell damage and increase susceptibility to disease). (cdc.gov)
  • The possible answers to these questions might be found in investigating the chemistry of volatile organic compounds found in the indoor environment, developing new sampling methods, and improving assessments of chemical health effects. (cdc.gov)
  • 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)
  • The Stockholm Convention is the fundamental document regarding protection of the environment and human health from persistent organic pollutants (POPs). (theses.cz)
  • Antarctica offers a good opportunity to investigate planetary-scale pollution and climate change, and provides baseline values for contaminants such as Trace Elements (TEs) and Persistent Organic Pollutants (POPs). (unive.it)
  • 2019. Trophic Magnification of Legacy Persistent Organic Pollutants in an Urban Terrestrial Food-Web . (sfu.ca)
  • Dr. Wang has been working over the last ten years developing approaches for monitoring, identification and analysis of organic chemical pollutants in the environment and human. (edu.au)
  • He led the research contributing to new understanding on the spatial and temporal trends in concentrations of atmospheric pollutants, new/changing source profiles and global comparative data. (edu.au)
  • 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)
  • Literature data on contaminant levels in the Antarctic environment indicate that long-range atmospheric transport is the primary pathway by which pollutants from surrounding continents are carried to this pristine environment. (unive.it)
  • 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)
  • Outdoor concentrations of all particle-related pollutants showed overnight decreases followed by increases during the morning rush hours. (edu.au)
  • Between 5:00 pm and 7:00 pm, indoor UFP and PM2.5 concentrations exceeded their mean daily values by 160% and 60%, respectively, suggesting that cooking is an extremely important source for these two pollutants. (edu.au)
  • Global long-range transport and lung cancer risk from polycyclic aromatic hydrocarbons shielded by coatings of organic aerosol. (oregonstate.edu)
  • We attribute this unexplained discrepancy to the shielding of BaP from oxidation by coatings of viscous organic aerosol (OA). (oregonstate.edu)
  • There is strong evidence that the organic aerosol is more highly oxidised, and hence less GC-volatile on haze days. (birmingham.ac.uk)
  • The impact of biomass burning on the concentrations of atmospheric aerosol is lesser in the summer but not negligible and is therefore one of the most relevant sources at the measurement site. (i-amica.it)
  • 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)
  • One-year characterization of organic aerosol markers in urban Beijing: Seasonal variation and spatiotemporal comparison[J]. Science of the Total Environment,2020,743:140689. (um.edu.mo)
  • Field measurements were conducted to determine aerosol chemical composition at a newly established remote high-altitude site in North Africa at the Atlas Mohammed V (AMV) atmospheric observatory located in the Middle Atlas Mountains. (copernicus.org)
  • The main objectives of the present work are to investigate the variations in the aerosol composition and better assess global and regional changes in atmospheric composition in North Africa. (copernicus.org)
  • Organic aerosol (OA) is a major component of fine particulate matter in the atmosphere and strongly influences air quality, climate, and human health. (mpic.de)
  • Our finding challenges the current understanding of the formation mechanism of atmospheric secondary organic aerosol and demonstrates a strong impact of particle-phase chemistry on the fate and climate effect of soot and combustion-related organic aerosols (e.g., from wildfires and fossil fuel combustions). (mpic.de)
  • The model was validated against observations of PAH concentrations and aerosol particulate mass fraction. (copernicus.org)
  • A&WMA International Conference on Aerosol and Atmospheric Optics: Visibility and Air Pollution (2012). (lbl.gov)
  • However, little information is available regarding the PM2.5-bound toxic organics, especially their sources, atmospheric transformations, and health implications. (cdc.gov)
  • Much higher concentrations and mass percentages for all species were observed in the heating season, indicating a higher toxicity of PM2.5 during this period of time. (cdc.gov)
  • Organic matter is a major component of PM2.5 in megacities. (birmingham.ac.uk)
  • Influences of Inorganic and Polycyclic Aromatic Hydrocarbons on the Sources of Pm2.5 in the Southeast Asian Urban Sites. (ukm.my)
  • To assess the residual impacts of the 2021 Marshall Fire (Colorado), a wildfire that predominantly burned homes and other human-made materials, on homes within the fire perimeter that escaped the fire, we performed a combination of fine particulate matter (PM2.5) filter sampling and chemical analysis, indoor dust collection and chemical analysis, community scale PurpleAir PM2.5 analysis, and indoor particle number concentration measurements. (nsf.gov)
  • Indoor airborne particulate organic carbon (median = 1.91 μg m−3), particulate elemental carbon (median = .02 μg m−3), and quantified semi-volatile organic species in PM2.5 were found in concentrations comparable to ambient air in urban areas across the USA. (nsf.gov)
  • Concentrations of airborne continuous fine particulate matter or (PM2.5), black carbon (BC), and ultrafine particles (UFP) were continuously measured over 5 days in winter and summer both indoors and outdoors at residences for forty-eight adults in 2005 and forty-seven asthmatic children in 2006. (edu.au)
  • During 2006, personal concentrations of PM2.5 were also measured continuously. (edu.au)
  • Mean outdoor concentrations of PM2.5, BC, and UFP were significantly higher than either indoor or personal concentrations. (edu.au)
  • Afternoon concentrations increased for UFP and decreased for BC, with PM2.5 staying about the same. (edu.au)
  • The increase of concentrations in the cold period is largely due to greater anthropogenic emissions from vehicular traffic and biomass burning, the latter being an important source in the study area. (i-amica.it)
  • Atmospheric Particulate Matter (PM) from biomass burning is often associated with respiratory and cardiovascular diseases, and even cancer. (fapesp.br)
  • The spatial distributions of these OA markers in China show higher concentrations in northern cities (mainly from coal combustion and biomass burning) than in southern cities (mainly from vehicular emission). (um.edu.mo)
  • Following the fire, the chemical speciation of dust collected in smoke-affected homes in the burned zone showed elevated concentrations of the biomass burning marker levoglucosan (medianlevo = 4147 ng g−1), EPA priority toxic polycyclic aromatic hydrocarbons (median Σ16PAH = 1859.3 ng g−1), and metals (median Σ20Metals = 34.6 mg g−1) when compared to samples collected in homes outside of the burn zone 6 months after the fire. (nsf.gov)
  • Based on these diagnostic tools, the increased abundance of atmospheric organic species during October could be attributed to the occurrence of regional smoke haze episodes due to biomass burning in Indonesia. (nottingham.edu.cn)
  • In J.S. Levine (Ed.), Global biomass burning: atmospheric, climatic and biospheric implications. (ac.ir)
  • 0.48 ppb, relative to a 0.04 ppb background), which are followed by a diversification of Acritarch species, suggests that combustion of 'early' terrestrial and marginallymarine biomass might have caused extensive smoke and atmospheric dimming, as well as subsequent photosynthetic stress. (edu.au)
  • Faster chemical degradation of BaP in the tropics leads to higher concentrations of BaP oxidation products over the tropics compared with higher latitudes. (oregonstate.edu)
  • In summer, high proportions (8%-24%) of phthalic acids, n-alkanes, fatty acids, and n-alcohols indicate dominant contributions of biogenic emission and atmospheric oxidation to OA in Beijing. (um.edu.mo)
  • We show that particle-phase photochemical oxidation of polycyclic aromatic hydrocarbons on soot can produce a substantial amount of highly oxygenated OA, which changes soot from being hydrophobic to being hydrophilic and increases the ability of soot particles to serve as cloud condensation nuclei. (mpic.de)
  • Petroleum compositional changes, recorded mainly in the low-molecular-weight aromatic and phenol fractions, were tentatively attributed to abiotic oxidation processes. (edu.au)
  • 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)
  • 2015. Soil organic fractions in cultivated and uncultivated Ferralsols in Uganda. (slm.go.ug)
  • 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)
  • The emission factors of organic carbon (OC) of gasoline and natural gas vehicles were much higher than those of elemental carbon (EC) in every test stage. (bvsalud.org)
  • 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)
  • 3-D backward air mass trajectory analyses together with the carbon preference index (CPI), molecular diagnostic ratios and molecular markers were used to investigate the origin of organic species measured in this study. (nottingham.edu.cn)
  • 2016. Critical soil organic carbon range for optimal crop response to mineral fertilizer nitrogen on a Ferralsol. (slm.go.ug)
  • 2015. Precision of farmer-based fertility ratings and soil organic carbon for crop production on a Ferralsol. (slm.go.ug)
  • Accumulation of aromatic hydrocarbons and their derivatives in large water bodies generally occurs through processes, such as atmospheric deposition, surface runoff, etc. (e-ijep.co.in)
  • 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)
  • They can be present as primary biogenic molecules, rearranged biogenic molecules, or secondary functionalized hydrocarbons. (edu.au)
  • His most significant work has been in the field of vehicle emitted particles, including their chemical composition and atmospheric processing. (wikipedia.org)
  • CHARON PTR-TOFMS is an on-line analytical technique that characterizes the molecular composition of sub-µm organic particles on a chemical composition level at a one-minute time-resolution. (ionicon.com)
  • The CHARON particle inlet consists of a honeycomb activated charcoal denuder that efficiently adsorbs organic gases and transmits particles, a high-pressure aerodynamic lens system that collimates and extracts sub-µm particles, and a thermo-desorber that evaporates non-refractory organic particulate matter at moderate temperatures of 100-160°C and reduced pressures of a few mbar. (ionicon.com)
  • As indoor dust particles are often resuspended and can become airborne, the enhanced concentration of hazardous metals and organics within dust samples may pose a threat to human health. (nsf.gov)
  • Metals concentrations were not affected by anthropogenic contributions, highlighting a natural accumulation with the age of the organism. (unive.it)
  • Particle number and size distribution analysis at a heavily instrumented supersite home located immediately next to the burned area showed indoor particulates in low concentrations (below 10 μg m−3) across various sizes of PM (12 nm-20 μm), but were elevated by resuspension from human activity, including cleaning. (nsf.gov)
  • The impacts of wildfires along the wildland urban interface (WUI) on atmospheric particulate concentrations and composition are an understudied source of air pollution exposure. (nsf.gov)
  • 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)
  • The indoor concentration of PM 10 exceeds the guidelines levels. (ac.ir)
  • 2019. Dietary Bioaccumulation and Biotransformation of Hydrophobic Organic Sunscreen Agents in Rainbow Trout . (sfu.ca)
  • How does atmospheric pollution affect professional sport? (kunakair.com)
  • What adverse consequences can result from being exposed to a high level of atmospheric pollution during physical exercise ? (kunakair.com)
  • Atmospheric Pollution Research 4 (2013) 398-404. (lbl.gov)
  • 2022. Development and testing of a mechanistic model for wetland treatment of neutral and polar organic contaminants in oil sands process-affected water: Application to the Kearl Treatment Wetland in Alberta, Canada. (sfu.ca)
  • Polar organic molecules are defined by differences in electronegativity between their atomic constituents and the resulting asymmetrical structures. (edu.au)
  • 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)
  • His interests extend from source emissions, through atmospheric chemical and physical transformations, to human exposures and effects upon health. (wikipedia.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)
  • This variable identifies the periods of the day with the lowest ambient concentrations. (kunakair.com)
  • Apart from being petroleum and coal origin, there are lots of modern amenities used by city residents of which these aromatic substances are either constituents or derivatives. (e-ijep.co.in)
  • A fire, involving organic substances, releases both heat and smoke. (springer.com)
  • 2023. Methods for Assessing the Bioaccumulation of Hydrocarbons and Related Substances in Terrestrial Organisms: A Critical Review . (sfu.ca)
  • 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)
  • 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)
  • The annual mean concentrations are simulated to the right order of magnitude for most cases and the model well captures the species and regional variations. (copernicus.org)
  • This forms the basis of the current understanding of the relationship of emissions to roadside concentrations and size distributions. (wikipedia.org)
  • 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)
  • Personal exposure to polycyclic aromatic hydrocarbons was quantified through wearable silicone wristbands , and showed highly variability across volunteers. (kunakair.com)
  • 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)
  • 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)
  • We find that this inconsistency arises from the widespread presence of extremely low-volatility (eLV) organics that coat BC. (mpic.de)
  • 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)
  • The efficiency of this process of extraction was determined with the help of high performance liquid chromatography, which is found to be as high as 90.75% in case of selected hydrocarbon-fluoranthene. (e-ijep.co.in)
  • There is no need for off-line particle pre-concentration e.g. by collection/desorption on surfaces. (ionicon.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)
  • Results showed higher PM 2.5 and PM 10 concentrations in the cold period (autumn and winter) compared to the warm period (spring and summer), with a seasonal variability of the chemical composition that allowed evaluating the variability of the contribution of the different sources using advanced statistical methods (Figure 1.2). (i-amica.it)
  • It was hypothesized that household tumble driers could be atmospheric sources of these microfibers. (researchgate.net)
  • These organics are subsequently analyzed as gas-phase analytes with one of IONICON's high-resolution PTR-TOFMS instruments. (ionicon.com)
  • The specific analytes measured in this method are monohydroxy-polycyclic aromatic hydrocarbons (OH-PAH). (cdc.gov)
  • Extraction techniques for determination of polycyclic aromatic hydrocarbons in water samples. (e-ijep.co.in)
  • This study presents a year-long measurement of 92 organic markers in PM samples collected at an urban site in Beijing from 2014 to 2015. (um.edu.mo)
  • 17 atmospheric samples were collected. (nottingham.edu.cn)
  • between 60% - 100% of the organic mass concentrations can be directly calculated without the need of any additional corrections. (ionicon.com)
  • The eluate was concentrated, and the phthalate metabolites chromatographically resolved by reversed-phase HPLC, detected by atmospheric pressure chemical ionization-tandem mass spectrometry (APCI-MS/MS), and quantified by isotope dilution. (cdc.gov)
  • He was educated at Henley Grammar School and the University of Birmingham, where he was awarded a Bachelor of Science degree in chemistry in 1969, followed by a PhD in organic chemistry in 1972 and a Doctor of Science degree in environmental chemistry in 1989. (wikipedia.org)
  • Source Apportionment of Atmospheric Polycyclic Aromatic Hydrocarbons Collected from an Urban Location in Birmingham, U.K.". Environmental Science & Technology. (wikipedia.org)