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Showing 1 to 12 of 12 for “"polynuclear aromatic hydrocarbons"”.
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The Photodecomposition of Polynuclear Aromatic Hydrocarbons in Natural Water Systems
Made available in DSpace on 2014-12-10T22:22:12Z (GMT). No. of bitstreams: 1 7500369.pdf: 4717469 bytes, checksum: 84e976154b5e37f7d47fe09e72006861 (MD5) Previous issue date: 1974
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Effects of plant flavonoids on the fate of polynuclear aromatic hydrocarbons in rhizosphere soil
High-molecular-weight polynuclear aromatic hydrocarbons (PAHs) are persistent in the environment although a wide variety of microorganisms can metabolize PAHs. In the past decades, laboratory and filed studies have shown that PAH degradation in soil is often limited by poor bioavailability and …
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The development of nano-sized silicas as analytical tools
… was used to collect four estrogenic compounds, polynuclear aromatic hydrocarbons and tributyltin from water. The recovery of extracted analytes by nanoscavengers exhibited good results
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Responses of respiratory system cells in vitro and in vivo to petrochemical combustion-derived ultrafine particles
… be coated with many other compounds, including polynuclear aromatic hydrocarbons (PAHs). Our laboratory group had previously characterized the generation of PAHs from incomplete combustion of the high volume petrochemical 1,3-butadiene (BD) and briefly described the biological effects of BD’s …
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Supercritical fluid extraction applied to environmental pollutants from Chesapeake Bay sediment
… (SFE) has been increasingly used to determine polynuclear aromatic hydrocarbons (P AHs) in environmental samples. As an alternative sample preparation technique, SFE offers the distinct advantages of greatly reduced sample preparation time, concentrated analyte ready for assay, and comparable …
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The effects of water-soluble fractions of naphthalene, phenanthrene, no. 2 fuel oil, and coal-tar creosote on the freshwater cladoceran, Daphnia pulex
… tests. A possible mechanism of action of polynuclear aromatic hydrocarbons upon endocrine systems is strongly suggested by the dramatic and diverse effects upon growth and reproduction in Daphnia pulex.
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Polymer pyrolysis and oxidation studies in a continuous feed and flow reactor : cellulose, polystyrene, and polyethylene
… products at 400 C are carbonyl compounds, hydrocarbons, furans, pyrans, and anhydrosugars. Cellulose in the presence of NaCl (5% of Cl) shows higher decomposition of levoglucosan and more rapid conversion of major initial products to CO and CO_2. Formation of major initial products, C_6 …
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Muskrat populations in Virginia's Elizabeth River: influence of environmental contaminants
… 1988. Twenty-two of 35 carcasses analyzed for polynuclear aromatic hydrocarbons (PAHs) had detectable levels of from 1 to 6 PAH compounds. Only three muskrats from the lower region and one from the upper region of the Elizabeth River had PAH concentrations greater than 0.03 ppm dry wt (lower …
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Supercritical Fluid Extraction Directly Coupled with Reversed Phase Liquid Chromatography for Quantitative Analysis of Analytes in Complex Matrices
… To evalute this novel hyphenated system, spiked polynuclear aromatic hydrocarbons (PAHs) in a sand matrix were used as target analytes with the achievement of quantitative results. Also PAHs in naturally contaminated soil were successfully extracted and quantitatively determined by this …
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Study of Hydrocarbon Waste Biodegradation and the Role of Biosurfactants in the Process
Two types of oily waste sludges generated by a railroad maintenance facility were studied to reduce the volume of hydrocarbon waste. The specific goals of this laboratory study were to evaluate rate and extent of microbial degradation, benefits of organism addition, role of biosurfactant, and …
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A study of the mechanism of the thermal decomposition of 1-bromo-2-(1-naphthyl)naphthyl-carbinol and related diarylcarbinols
The synthesis of a variety of polynuclear aromatic hydrocarbons by means of the condensation of grignard reagents with aromatic aldehydes did not always lead to the isolation of the desired diarylcarbinols. The delicate relationship between molecular structure and physiological activity demanded …
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PAK-Freisetzung aus tauchgeteerten Rohren unter Berücksichtigung verschiedener Wasserqualitäten
Der Einfluss des Biofilms, der Inkrustation, der Fließgeschwindigkeit und der Wasserqualität auf die Freisetzung von PAK wurde in Batch-, Drehkolbenreaktorversuchen und an einem Rohrleitungssystem untersucht. Chlorung von tauchgeteerten Edelstahlcoupons mit Biofilm führten zu einer fast …