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Showing 1 to 20 of 37 for “"polyaromatic hydrocarbons"”.
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An investigation of structure activity relationships for aryl nitrenium stability and mutagenicity for amino polyaromatic hydrocarbons
Amino polyaromatic hydrocarbons (amino PAHs) and nitro polyaromatic hydrocarbons (nitro PAHs), two highly mutagenic classes of compounds, are proposed to be metabolized to an electrophilic aryl nitrenium ion which attacks DNA and forms DNA adducts. A structure-activity relationship was investigated …
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Study of Polyaromatic Hydrocarbons Emitted in the Fly Ash from Coal Combustion in a Fluidized Bed Combuster
Exposure to Polyaromatic Hydrocarbons (PAHs) has long been identified as an environmental concern because of their carcinogenic and mutagenic effects. The Environmental Protection Agency (EPA) has developed a list of 16 PAHs that are found on the Priority Pollutant List due to the extensive amount …
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Hydrogenation of nanostructured carbon, synthesis of organic semiconductors and progress towards synthesis of fullerenes and nanoribbons from polyaromatic hydrocarbons
<p>The hydrogenation of carbon allotropes including fullerenes, nanotubes and graphene was investigated using polyamines as hydrogenation reagents. In each case, a rapid, scalable and reversible hydrogenation was observed. The mechanism of hydrogenation was explored using several different …
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Toxicity mechanism of anthropogenic water contaminants: drinking water disinfection by-products (haloacetic acids) and particle associated contaminants from sealcoats (polyaromatic hydrocarbons) in lake sediments
… of the particle associated contaminants such as polyaromatic hydrocarbons (PAHs) associated with coal tar and soot, extracted from lake core sediments. Studies based on the toxicity mechanism of HAAs water DBPs demonstrated that monoHAAs were the strongest inhibitors of glyceraldehyde-3-phosphate …
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Application of trace analysis and chemometrics to environmental problems
… project continued with an investigation into polyaromatic hydrocarbons in a South Gwent Valley. A procedure was determined which involved extraction, clean-up and HPLC analysis. The analytical system was validated and applied to a series of soil samples. The resulting data were subjected to a …
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A Study of the Effect of the Extraction Procedure in the Analysis of Organic Compounds Adsorbed on Coal Ash
… reported as being adsorbed on the ash are polyaromatic hydrocarbons (PAHs). This study represents an attempt to evaluate the parameters involved in the extraction, detection and quantitation of these organic compounds. Though no definite conclusions could be reached as to the most efficient …
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Effect of oil age on polyaromatic hydrocarbon emissions from automobiles
Automobiles are known to emit polyaromatic hydrocarbons. The literature indicates that the emission levels of these compounds are correlated with oil age, and it has been hypothesized that entry of oil into the combustion chamber is a major cause of these emissions. This experiment investigated the …
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Computational investigation on polycyclic aromatic hydrocarbons in the molecular and solid phases
… (angular) and dibenzo[def,mno]chrysene (compact) polyaromatic hydrocarbons and their bis-triisopropylsilylethynyl (TIPS)-functionalized and per- halogenated (F, Cl) counterparts. We used all-electrons density functional theory(DFT)and time- dependent DFT(TDDFT)to quantify the effects of morphology …
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Direct measurement and analysis of cyclohexadienyl oxidation
… link to the formation of soot and other large polyaromatic hydrocarbons (PAH's). Thus, the cyclohexadienyl radical moiety is important in many chemical processes, and its detailed study is of interest in many areas. In this work, cyclohexadienyl radical is studied both computationally and …
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A Hazard Assessment of a Landfill Site
… chemical identification of alkylbenzenes and polyaromatic hydrocarbons indicates that the filter cake was not the only industrial source of waste to be deposited at the site.<br/><br/>The results of the analysis were used to determine what courses of action are open to the local council to …
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Silica Based Solid Phase Extraction Sorbent with a Removable Alkyltrimethylammonium Surfactant Phase
… type and concentration. The extraction of three polyaromatic hydrocarbons, naphthalene, pyrene and benzo(ghi)perylene, is investigated using this sorbent material. A silica based strong cation exchange resin (SCX-2) having a sulfopropyl group is explored and compared with the commercially …
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Residual Diesel Range Organics and Selected Frothers in Process Waters from Fine Coal Flotation
… of fine coal. Diesel range organics (DRO) and polyaromatic hydrocarbons (PAHs) are measured in aqueous samples using gas chromatography equipped with either a flame ionization detector (GC-FID) or a mass spectrometer (GC-MS). Samples are subjected to a variety of test conditions in order to …
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Calorimetric studies of small-molecule adsorption to carbon nanotubes
… agreement with other studies, it was shown that polyaromatic hydrocarbons (PAHs) that can achieve a greater degree of n-orbital overlap with the curved surface of carbon nanotubes (CNTs) adsorb more strongly. ITC studies also indicated that adsorption of a in-basic metalloaromatic gold pyrazolate …
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Pesticide distribution in water, sediment, and fish of the Occoquan Watershed
… chemicals (SOCs), including pesticides and polyaromatic hydrocarbons (PAHs), have been identified as possible contaminants in the Occoquan Watershed. Since 1982, water, sediment, and fish samples have been collected from the streams and reservoirs of the watershed 2-4 times per year. The …
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Synthesis of fluoromodified carbon rich electron acceptors and exploration of their structural, electronic, and device properties
… properties of carbon rich substrates such as polyaromatic hydrocarbons (PAHs) and fullerenes can be improved, making these derivatives attractive semiconductor materials for organic electronics applications. This work will discuss research which has focused on expanding the library of electron …
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The characterisation of crude oils and the analysis of by-products produced in petrochemical plants
… in crude oils. A standard hexane solution of polyaromatic hydrocarbons (PAHs) was used for SPE method development using a coupled silic cyano cartridge system. Quantitative GC/MS analysis confirmed that the SPE method developed provided potential for the high recovery of the PAHs within a …
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Evaluating the impacts of an urban catchment on water and sediment quality of a receiving river
… lead, mercury, nickel, tin and zinc) and 11 polyaromatic hydrocarbons (PAHs) including anthracene, fluoranthene, benzo(b)fluoranthene and benzo(a)pyrene. Laboratory batch test experiments which focused on evaluating the release of metals from field sediments were undertaken to better …
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Bioremediation of biodiesel and diesel contaminated soil by pseudomonas putida
… Presence of these contaminants containing polyaromatic hydrocarbons (PAHs) in soil is toxic to humans, plants and soil microorganisms due to their recalcitrant and mutagenic or carcinogenic properties. Therefore, this study was conducted to suggest a new technique of treatment to clean up …
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Soluble and Functional Overexpression of the Ligand Binding Domain of Mouse Aryl Hydrocarbon Receptor in <i>E.Coli</i>
… and carcinogenesis is mediated through various polyaromatic hydrocarbons and other environmental pollutants. The role of AhR in carcinogenesis is an area of concern due its altered levels in various tumors. AhR binds structurally diverse ligands and may elicit different responses upon ligand …
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The morphology and kinematics of star forming regions
… between the gas temperature and emission from PolyAromatic Hydrocarbons. A clump of enhanced emission ahead of a Herbig-Haro object is thought to be due to photodesorption of CO ice from the surface of dust grains. A chain of similar clumps, following an arc equidistant from the YSO, suggest …
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