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.
Results
Showing 1 to 20 of 206 for “"PAHs"”.
-
Use of solvents for PAHs extraction and enhancement of the PAHs bioremediation in coal-tar-contaminated soils
… of the polycyclic aromatic hydrocarbons (PAHs) and their high partitioning with soils. As such, not all the PAHs present in the soil will be available for biodegradation. Enhancing the availability of PAHs will make bioremediation attractive as a treatment technology. Because of the PAH …
-
Stanovení PAHs ve vybraných rostlinných matricích a půdě
… polycyklických aromatických uhlovodíků (PAHs) v půdě a rostlinném materiálu v lokalitě Brno–Královo Pole. PAHs jsou významné environmentální polutanty vznikající především při nedokonalém spalování organických látek a vzhledem ke své perzistenci a toxickým účinkům představují riziko pro …
-
Efficiency of PAHs removal from clayey soil using supercritical fluid extraction
… was used to examine the extraction efficiency of PAHs from clayey soil. Phenanthrene concentration in soil specimen was determined by UV. Carbon dioxide was chosen as the supercritical fluid and 5% (mol) methanol was used as a modifier. The highest recovery (72%) from clay was obtained at a …
-
Mass balance and 3D model of PAHs in Boston's inner harbor
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
-
Detection of PAHs in Commercial and Wild Caught Fish Oil using Scanning Fluorescence Spectroscopy
… oil contains polycyclic aromatic hydrocarbon (PAHs). Some PAHs are carcinogenic to fish and humans. The purpose of this project was to develop menhaden fish oil as a biomonitoring tool for crude oil contaminants such as PAHs using scanning fluorescence spectroscopy (SFS). Menhaden (Genus …
-
Assessing the fate of PAHs in the Boston Inner Harbor using semipermeable membrane devices (SPMDs)
… the following polycyclic aromatic hydrocarbons (PAHs) in three locations of the Boston Inner Harbor: phenanthrene, methylphenanthrene's, fluoranthene, pyrene, benz(a)anthracene, and chrysene. The field measurements ranged from 0.61 to 90 ng/L for the various PAHs at the base of Tobin Bridge, the …
-
An Evaluation of exposures to respirable particulates, environmental PM2.5, PAHs and metal compounds in Western Australia
… to Respirable Particulates, Environmental PM2.5, PAHs and Metal Compounds in The South West of Western Australia. A cross sectional study to evaluate the exposures of children (n=18), and controls (n=15) to respirable particulates PAHs and metal compounds in the South West of Australia during …
-
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 …
-
Strengths and limitations of bioretention sorbent amendments to simultaneously remove metals, PAHs, and nutrients from urban stormwater runoff
… nutrients (ammonium, nitrate, and phosphate) and PAHs (pyrene (PYR), phenanthrene (PHE), acenaphthylene (ACY) and naphthalene (NAP)). First, batch studies were used to investigate the sorption capacities, kinetics, and the effects of different water quality parameters on sorbents performance. …
-
Development of a hybrid electrokinetic system for the simultaneous removal of heavy metals and PAHs from clayey soil
Several industrial and municipal areas in North America are contaminated with heavy metals and petroleum products. This mixed contamination presents a particularly difficult task for remediation when dealing with clayey soil. The objective of this research was to develop a method to clean mixed …
-
Temporal and Spatial Assessment of PAHs in Water, Sediment, and Oysters as a Result of the Deepwater Horizon Oil Spill
… oil-associated polycyclic aromatic hydrocarbons (PAHs) in the water and sediment could severely impact the aquatic organisms inhabiting the Gulf of Mexico (i.e. developmental defects, reproductive effects, death, etc.). Therefore, water, sediment and oyster, <italic>Crassostrea virginica</italic>, …
-
Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary
In order to examine the importance of sediment resuspension on the sediment bed-to-water column transport of hydrophobic organic contaminants (HOCs) in the lower Hudson Estuary, the following areas of research were pursued: 1) a passive, in situ sampler, a polyethylene device (PED), for measuring …
-
Field and Greenhouse Studies of Phytoremediation with California Native Plants for Soil Contaminated with Petroleum Hydrocarbons, PAHs, PCBs, Chlorinated Dioxins/Furans, and Heavy Metals
… hydrocarbons (PHCs), poly-aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), chlorinated dioxins/furans, and heavy metals. This screening was followed by controlled greenhouse experiments to further evaluate the phytoremediation potential of the best candidates. Field specimens and …
-
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% …
-
An On-line Test for Polycyclic Aromatic Hydrocarbons in the Flue Gas from Coal Combustion in an FBC System
Polycyclic Aromatic Hydrocarbons (PAHs) are environmental pollutants that have received considerable attention because of their carcinogenic and mutagenic effects. Due to the extensive amount of data suggesting the hazards of these compounds, 16 PAHs are on the Environmental Protection Agency (EPA) …
-
Biomarkers of Human Exposure and Effect to Petrogenic Polycyclic Aromatic Hydrocarbons
… 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 potent activators of the Aryl …
-
Modelling the optical, kinetic, and thermodynamic properties of soot precursor molecules
… molecules, namely polyaromatic hydrocarbons (PAHs), by applying \textit{ab initio} quantum chemical methods. In particular, density functional theory (DFT) is applied to study the properties of several different types of PAHs, including curved PAHs, localized $\pi$-radical PAHs, and …
-
A Study of Polycyclic Aromatic Hydrocarbons During Combustion in an AFBC System
… 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 pollutants due to their mutagenic and …
Page 1 of 11