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 34 for “"dioxins"”.
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Sediment Dynamics and Associations with Polychlorinated Biphenyls and Dioxins in an Urban Estuary
Polychlorinated biphenyls (PCBs) and dibenzo-p-dioxins and dibenzofurans (PCDD/Fs, or “dioxins”) in the sediments of aquatic systems is a persistent global problem that poses serious health risks. This dissertation focuses on understanding the occurrence of PCBs and dioxins in the sediments of the …
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Phase Speciation of Carbohydrates and Dioxins in Rivers and Coastal Waters in the Northern Gulf of Mexico
<p>Dissolved carbohydrates (d-CHO), including monosaccharide (MCHO) and polysaccharides (PCHO), and particulate carbohydrates (p-CHO) are major components of natural organic matter and play an important role in biogeochemical cycles of carbon and other trace elements in marine environments. This …
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Assessment of dietary background exposure of the Irish adult population to dioxins and PCBs particularly taking into account additional exposure due to the 2008 Irish dioxin food contamination incident
… dietary background exposure of Irish adults to dioxins and PCBs. Furthermore, all available information on the 2008 Irish pork dioxin food contamination incident was collated and analysed with a view to evaluate any potential impact the incident may have had on general dioxin and PCB background …
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Field and Greenhouse Studies of Phytoremediation with California Native Plants for Soil Contaminated with Petroleum Hydrocarbons, PAHs, PCBs, Chlorinated Dioxins/Furans, and Heavy Metals
… 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 soils used for this study were collected from the …
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Sorption mechanisms of dibenzo-p-dioxin/furan from water by smectite clays and theoretical studies on formation pathways of chlorodibenzo-p-dioxins from precursor chlorophenols on smectite clays
… minerals may be an important sorptive phase for dioxins in soils, and dioxins are often found in natural clay deposits. Sorption experiments demonstrated that smectites, especially Cs-saponite, effectively adsorbed dibenzo-p-dioxin /furan from water. Adsorption was promoted by exchangeable …
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A Chemical Pathway to the Formation of Chlorinated Compounds During Combustion
… starting steps for the formation of chlorinated dioxins during the incineration of the refuse derived fuel, were investigated in this work. Reactions were conducted in a tube furnace, and the products were trapped and analyzed by gas chromatography/mass spectroscopy. It was shown that the Deacon …
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The effect of different sample preparatory protocols on the induction of the aryl hydrocarbon receptor (AhR) in the H4IIE–luc reporter gene bio–assay
… of POPs consisting of polychlorinated dibenzo-pdioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (dl-PCBs), collectively referred to as dioxins, are of particular concern due to their high toxicity and persistence. Additionally, the analysis of …
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A GIS-Based Comparative Study of Superfund Contaminants and the Threat They Represent to Eastern Harris County Communities
… which contain benzene as well as polychlorinated dioxins, furans, and biphenyls Polychlorinated Dibenzo-p-dioxins, Polychlorinated dibenzofurans, and Polychlorinated Biphenyls above the MCL and lie near communities in Deer Park, Pasadena, Galena Park, and Jacinto City. Therefore, each Superfund …
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Formation of Environmentally Persistent Free Radicals on the Surface of Iron Oxide and Interior of Montmorillonite Clay
… the formation of toxic compounds such as dioxins and furans. EPFRs are known to form on metal oxide nanoparticles’ surface, including iron (III) oxide, and within cation-rich clays. Plane-wave based ab initio computational methods were used to study the mechanism of formation of EPFRs on …
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Design, Synthesis and Characterization of Heme-proteins: Developing Potential Catalysts for Bio-remediation
… compounds such as polychlorinated biphenyls or dioxins. This thesis explores the use of protein design approaches to produce chemically and molecularly modified enzymes, which are highly stable, possess little substrate specificity, and have higher activity than the natural enzymes. The …
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Assessment of Microbial Biodegradation of Mixed Soil Contaminants at the Santa Susan Field Laboratory Using TRFLP, qPCR, and Culturing
… site include polychlorinated biphenyls (PCBs), dioxins, polycyclic aromatic hydrocarbons (PAHs) and non-PAH petroleum hydrocarbons (PHCs). Various metals, most notably mercury and silver, are also present on the site. The purpose of this study was to determine if biodegradation is contributing …
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Overexpression of Human Aryl Hydrocarbon Receptor in <i> E.coli</i> Using Two Different Solubility Enhancing Tags
<p>Dioxins such as TCDD are environment pollutants whose toxic effects are mediated via aryl hydrocarbon receptor (AhR) signaling pathway. AhR is a ligand sensitive transcription factor. The unbound AhR resides in cytoplasm as a complex containing p23, Hsp90 and XAP2. Upon ligand binding, AhR …
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Greening the invisible hand : how environmental non-governmental organizations (NGOs) succeed and fall in technology change
… The technologies they tried to diffuse reduced dioxins and other organochlorines from mills that bleach pulp for making white paper products. Totally chlorine-free (TCF) bleaching emerged as the cleanest bleaching technology in commercial use: it eliminated organochlorine water pollution. The …
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Black carbon in the Gulf of Maine : new insights into inputs and cycling of combustion-derived organic carbon
… like polycyclic aromatic hydrocarbons (PAHs) and dioxins would have their "bioavailabilities" controlled by sorption to BC.
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Ex ante assessment of secondary impacts of environmental regulation: case study--organochlorines in the Canadian pulp and paper industry
… and paper industry via federal regulation of dioxins and furans and British Columbia's regulation of Adsorbable Organic Halogen (AOX). The thesis is founded upon the premise that sustainability must be an integral consideration. A systems approach is used to evaluate assessments and to …
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'Incineration: A burning issue or a load of rubbish?’ Examining public attitudes to municipal solid waste incineration
… the negative aspects were to do with smell and dioxins. Of those that mentioned advantages to incineration, many thought it would require less space than landfill and would be cleaner. The media it seems provided too much negative information on the topic. Although many respondents thought …
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High-throughput analysis of emerging and historical pollutants in biological matrices.
… method was developed for polychlorodibenzo-p-dioxins/furans (PCDD/Fs) and dioxin-like polychlorobiphenyls (dl-PCBs) by incorporating pressurized liquid extraction and multiple cleanup techniques. Sample preparation time and solvents were reduced as much as 95% and 65%, respectively, as …
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Compound Events and Exposure Science: Characterizing Mixtures and Assessing Cumulative Risks Using Participatory Research Methods
… polycyclic aromatic hydrocarbons (PAHs), and dioxins across soil, rooftop-harvested rainwater, settled dust, and drinking water, providing a comprehensive understanding of contaminant distribution, transport, and human exposure pathways. Therefore, this work utilized a systems thinking …
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