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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 221 for “"Polycyclic aromatic hydrocarbons"”.
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Gas-phase Ion Chemistry of Hydroxy and Amino-substituted Interstellar Polycyclic Aromatic Hydrocarbons and Protonated Polycyclic Aromatic Hydrocarbons
… ion chemistry of hydroxyl- and amino-substituted polycyclic aromatic hydrocarbons (PAHs) and their protonated counterparts were studied using mass spectrometry. Ions were generated using an electron ionization (EI) source and the unimolecular chemistry of metastable ions was studied by performing …
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Dermal exposure to polycyclic aromatic hydrocarbons among workers
Contains fulltext : mmubn000001_180842978.pdf (Publisher’s version ) (Open Access)
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Lichens as biomonitors for atmospheric polycyclic aromatic hydrocarbons
… first time in Africa, studies investigating the polycyclic aromatic hydrocarbons (PAHs) levels in lichens (species Parmotrema austrosinense (Zalhbr.) Hale) was performed successfully using various sample preparation techniques. Sampling campaigns were conducted at 5 different sites across South …
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Studies of Polycyclic Aromatic Hydrocarbons in Urban Atmospheres
Polycyclic aromatic hydrocarbons (PAH) are known to exist in urban atmospheres and are suspected of carcinogenic potential. The implementation of emission control regulations and changes in fuel usage over the last twenty-five years has affected air quality in general and PAH concentrations in …
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Microbial degradation of high molecular weight polycyclic aromatic hydrocarbons
The bacterial degradation of high molecular weight PAHs was investigated by isolating communities and individual strains from a PAH-contaminated site. Microbiological analysis of soils from Port Melbourne, Australia, resulted in the enrichment of five microbial communities capable of degrading …
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QUINODIMETHANES - AN EFFECTIVE STABILIZATION STRATEGY FOR POLYCYCLIC AROMATIC HYDROCARBONS
The union of a quinodimethane (QDM) core with a polycyclic aromatic hydrocarbon (PAH) framework led to the birth of a new class of quinoidal polycyclic/heterocyclic hydrocarbons (PHs) with numerous potential applications in materials chemistry. Over the years, intensive research efforts involving …
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Photochemistry of Polycyclic Aromatic Hydrocarbons with Environmentally Relevant Metals
… atmosphere and water systems between persistent aromatic compounds and varying species of metals with an emphasis on iron. Bulk water suspensions of a standard soil and polycyclic aromatic hydrocarbons (PAH) were analyzed for soluble iron by inductively-coupled plasma mass spectroscopy (ICP-MS) …
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Polycyclic Aromatic Hydrocarbons and the Microbiomes of Two Benthic Species
… the Mississippi Sound and the concentration of polycyclic aromatic hydrocarbons (PAHs) within the oyster tissue, shell and nearby sediment were measured. Analysis of the flounder microbiome showed significant responses to both the oil and pathogen exposure, but those responses differ between …
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The Origin of Polycyclic Aromatic Hydrocarbons in Diesel Exhaust Emissions
… investigated the origin of a group of compounds, polycyclic aromatic hydrocarbons (PAH), in diesel exhaust emissions using 14C-radiotracer techniques developed specifically to investigate the origin of the organic components in diesel emissions. The use of radiotracers in this research has enabled …
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Physico-chemical speciation and ocean fluxes of Polycyclic Aromatic Hydrocarbons
Thesis (Ph. D.)--Joint Program in Oceanography, Massachusetts Institute of Technology/Woods Hole Oceanographic Institution, 1997.
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Atmospheric partitioning of polycyclic aromatic hydrocarbons (PAH) and oxygenated PAH
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1997.
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The removal of carcinogenic polycyclic aromatic hydrocarbons by activated sludge
Benzo-a-pyrene, a carcinogenic polycyclic aromatic hydrocarbon, was injected into the aeration tank of an activated sludge pilot plant in an investigation to determine the ability of activated sludge to effectively treat this compound. The method employed to segregate Benzo-a-pyrene from other …
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Biomarkers of Human Exposure and Effect to Petrogenic Polycyclic Aromatic Hydrocarbons
… Deepwater Horizon (DWH) oil spill. Petrogenic polycyclic aromatic hydrocarbons (PAHs) found in crude oil have the potential to bioaccumulate in seafood and render consumers vulnerable to adverse health effects. Despite the knowledge that alkylated PAHs abundant in petrogenic PAH mixtures can be …
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Uptake and growth effects of polycyclic aromatic hydrocarbons in wetland plants
<p>Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous contaminants in estuarine environments, but little is known about the distribution and fate of PAHs in wetland sediments and plants. The effect of PAHs on common salt marsh plants, and the PAH distribution within the plants, sediment, and …
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Monitoring of atmospheric polycyclic aromatic hydrocarbons through optimization of analytical techniques
… impacts and the global burden of disease. Polycyclic aromatic hydrocarbons (PAHs) have been widely used as markers of environmental pollutants in the context of ambient air, indoors, as well as in working environments. Sampling, extraction, sample clean up and analysis constitute the …
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ULTRAFAST DYNAMICS IN NITRO- AND (ORGANOPHOSPHINE)GOLD(I)-POLYCYCLIC AROMATIC HYDROCARBONS
The light-induced relaxation pathways of various polycyclic aromatic hydrocarbon (PAH) derivatives were studied using broadband transient absorption with femtosecond (10<sup>-15</sup> s) time resolution, steady-state Xe-lamp irradiation, UV/Vis spectroscopy and HPLC methods. Ground- and …
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Polycyclic Aromatic Hydrocarbons and Redox Parameters in a Creosote-Contaminated Aquifer
… plume and enhance phytoremediation. Ten polycyclic aromatic hydrocarbons (PAHs) were monitored along with several terminal electron acceptors (TEAs) and their reduced end products. The focus of the study was to determine the extent of natural biodegradation in the subsurface and assess …
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A Study of Polycyclic Aromatic Hydrocarbons During Combustion in an AFBC System
… method of analysis which leads to the study of polycyclic aromatic hydrocarbons (PAHs) during combustion in an atmospheric fluidized bed combustor (AFBC) system. The study of PAHs is important because they may be produced upon the combustion of coal. The US EPA prioritizes PAHs as major …
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Degradation of polycyclic aromatic hydrocarbons in water: Alternative treatments to conventional processes.
Nowadays, polycyclic aromatic hydrocarbons (PAHs) are a group of chemical substances that deserves a great attention. PAHs consist of two or more condensed benzene rings, bonded in linear, cluster or angular arrangements that are ubiquitous in the environment. Due to their low solubility and high …
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