Global ETD Search
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 116 for “"polycyclic aromatic hydrocarbons (PAHs)"”.
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Investigations into the determination of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) by capillary gas chromatography
Factors involved in the determination of PAHs (16 priority PAHs as an example) and PCBs (10 PCB congeners, representing 10 isomeric groups) by capillary gas chromatography coupled with mass spectrometry (GC/MS, for PAHs) and electron capture detection (GC/ECD , for PCBs) were studied, with emphasis …
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Investigations into the extraction and the determination of polycyclic aromatic hydrocarbons (PAHs) from water by solid-phase extraction and capillary gas chromatography/ mass spectrometry
Factors affecting the detennination of PAHs by capillary GC/MS were studied. The effect of the initial column temperature and the injection solvent on the peak areas and heights of sixteen PAHs, considered as priority pollutants, USillg crosslinked methyl silicone (DB!) and 5% diphenyl, 94% …
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ZETHRENE AND EXTENDED ZETHRENE BASED DIRADICALOIDS AND TETRARADICALOIDS
Open-shell polycyclic aromatic hydrocarbons (PAHs) have recently attracted increasing interest due to their unique optical, electronic and magnetic properties and potential applications in organic electronics, nonlinear optics, spintronics, and energy storage devices. This thesis describes the …
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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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Synthesis, Physical Properties and Applications of Bisanthene-based Near Infrared Dyes and Semiconductors
… block for electronics or to construct novel polycyclic aromatic hydrocarbons (PAHs). However, the investigation on bisanthene has not been so prosperous because of its photo-unstability and poor solubility. Based on the knowledge above, new soluble and stable bisanthene-based molecules and …
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Predictive modeling of polycyclic aromatic hydrocarbon formation during pyrolysis
Polycyclic aromatic hydrocarbons (PAHs), large molecules comprised of multiple aromatic rings like anthracene or pyrene, are a notable intermediate and byproduct in combustion or pyrolysis of hydrocarbon fuels. On their own, they have been shown to pose a significant health risk, with certain PAHs …
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Identification and characterisation of bacterial genes associated with resistance to and/or degradation of environmental pollutants
… one contaminated with lead and the other with Polycyclic Aromatic Hydrocarbons (PAHs). Alcaligenes sp. AO22 and Arthrobacter sp. E9 were identified from the lead contaminated site, while Stenotrophomonas maltophilia was identified from the PAH contaminated site. Minimum Inhibitory Concentration …
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Laboratory Investigations Into the Fate of Aromatic Pollutants in Natural Waters
… We have measured photolysis kinetics of the polycyclic aromatic hydrocarbons (PAHs) anthracene and pyrene in several organic solvents and in water, in miscible and phase-separated aqueous-organic mixtures, in the presence of halide salts (NaCl, NaBr, and NaI), and in simulated seawater. …
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Substrate Specificity and Molecular Characterization of PAH-Degrading Anaerobic Enrichment Cultures Under Methanogenic Conditions
… capable of degrading the low-molecular-weight polycyclic aromatic hydrocarbons (PAHs), naphthalene or phenanthrene, as a sole carbon source. Characterization of the enrichment cultures by 16S rDNA analysis revealed two unique populations, though they were initiated from the same sediment …
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Estimation method for the thermochemical properties of polycyclic aromatic molecules
Polycyclic aromatic molecules, including polycyclic aromatic hydrocarbons (PAHs) have attracted considerable attention in the past few decades. They are formed during the incomplete combustion of hydrocarbon fuels and are precursors of soot. Some PAHs are known carcinogens, and control of their …
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Molecular and isotopic records of combustion inputs to the environment over the last 250 years
The most ubiquitous source of polycyclic aromatic hydrocarbons (PAHs) to the environment is incomplete combustion. This study generated a high-resolution historical record of pyrogenic PAH emissions since pre-industrial times from anoxic aquatic sediments, allowing for detailed comparison with …
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Petrogenic Polycyclic Aromatic Hydrocarbon Levels and Health of Gulf Coast Communities Following the Deepwater Horizon Oil Spill
… barrels of crude oil, containing petrogenic polycyclic aromatic hydrocarbons (PAHs), into the Gulf of Mexico. Few studies have described the effects that the Deepwater Horizon oil spill has had on human health. Utilizing an ongoing longitudinal cohort study we set out to investigate the …
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Molecular and isotopic records of the combustion inputs to the environment over the last 250 yrs
The most ubiquitous source of polycyclic aromatic hydrocarbons (PAHs) to the environment is incomplete combustion. This study generated a high-resolution historical record of pyrogenic PAH emissions since pre-industrial times from anoxic aquatic sediments, allowing for detailed comparison with …
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A Survey of Superfund Chemicals in Massachusetts Farms
… and lead) and 334 organic compounds (including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), and volatile organic compounds (VOCs)) in water, soil and produce samples from organic farms in Massachusetts, USA. Measured concentrations …
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Pseudostationary Phase for Solid Phase Extraction
… hydrophobicity to capture EPA 16 priority polycyclic aromatic hydrocarbons (PAHs). PAHs were preconcentrated from river water and were determined using fluorescence detector coupled to high performance liquid chromatography (HPLC). Detections limits for all PAHs examined were lower than …
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Analogue enrichment of aromatic degradation through application of lignin-derived phenols
… population responsible for degradation of polycyclic aromatic hydrocarbons (PAHs) in PAH-contaminated urban soils using naturally occurring lignin-derived phenols (13C-vanillin substrates). The influence of vanillin substrates on the 13C-signatures as identified on the 16S rRNA gene …
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Black carbon in marine sediments : quantification and implications for the sorption of polycyclic aromatic hydrocarbons
… is a key factor in determining the fate of polycyclic aromatic hydrocarbons (PAHs) in the environment. Here, PAH sorption is proposed as the sum of two mechanisms: absorption into a biogenic, organic carbon (OC) fraction and adsorption onto a combustion-derived, black carbon (BC) fraction. …
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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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Synthetic and Computational Studies on Polycyclic Aromatic Hydrocarbon Derivatives, Nucleoside Analogs and Peptides
… and computational modeling studies performed. Polycyclic aromatic hydrocarbons (PAHs) and β-peptides are among synthetic organic compounds known to interact with natural biological macromolecules. This interaction may affect the specific biological functions of the biomacromolecules. A variety …
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