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 20 for “"PCDD"”.
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Anaerobic Microbial Dechlorination of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Contaminated Kymijoki River Sediments
… and polychlorinated dibenzofurans (PCDD/Fs) accumulate in the environment in sediments and soils. PCDD/Fs may pose considerable environmental and health risks because of their persistence in the environment. PCDD/Fs can be degraded slowly by microbial reductive dechlorination under …
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Infrared and x-ray spectroscopic studies of the copper(II) oxide mediated reactions of chlorinated aromatic precursors to PCDD/F
… dibenzo-p-dioxins and dibenzofurans (PCDD/F) are toxic compounds produced in combustion systems such as incinerators, and their emissions are an important environmental issue. Chlorinated phenols and benzenes form PCDD/F through heterogeneous reactions following adsorption onto fly-ash …
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Iron (III) Oxide and Copper (II) Oxide Mediated Formation of PCDD/Fs from Thermal Degradation of 2-MCP and 1,2-DCBz
… dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) which occurs inexorably from most thermal and combustion processes constitutes a major toxic component of environmental pollutants. Generally, it is well established that transition metal-mediated reactions account for the majority of …
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Experimental field studies and predictive modelling of PCB and PCDD/F levels in Australian farmed Southern Bluefin Tuna (Thunnus maccoyii).
… dibenzo-p-dioxins / dibenzofurans (PCDD/Fs). This research presents the investigations and experimental validation of a predictive model that can be used to address the levels of residues in the fillets of farmed SBT at harvest from feeding (as the source) when applied to SBT …
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Il contributo di sorgenti locali sull'impatto ambientale da Diossine e Furani
Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are ubiquitous contaminants, mainly released into the environment during combustion processes (point sources), but also from other sources (traffic, waste incinerators, uncontrolled combustion). This Ph.D. thesis is …
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Thermal treatment of organic contaminated solids and waste : experiment, model and mass balance
… percent of the energy. Data on concentrations of PCDD/F in the feed, and in the effluent from modern Municipal Solid Waste Incinerators (MSWI) are surveyed and evaluated to determine if more PCDD/F are destroyed than formed in the Municipal Solid Waste (MSW) incineration process. Tile results show …
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The determination and environmental significance of planar aromatic compounds in the marine environment.
… (CBs), polychlorinated dioxins and -furans (PCDD/Fs) and polycyclic aromatic hydrocarbons (PAHs). Previous studies on toxicity, occurrence, origins and methods of analysis were reviewed, and methods of analysis for the determination of planar aromatic compounds were developed, adapted and …
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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
… 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 dioxins is …
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High-throughput analysis of emerging and historical pollutants in biological matrices.
… 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 compared to a …
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Biochemistry of micro-polutants in sediments of Mtoni estuary, Tanzania
… tropical mangrove sediments. Moreover, metals, PCDD/Fs and dioxin-like PCBs were analysed to describe their current sources and fates in response to anthropogenic and natural changes. Lastly, the study intended to determine and compare the variability in the distribution of potential …
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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
Irish monitoring data on PCDD/Fs, DL-PCBs and Marker PCBs were collated and combined with Irish Adult Food Consumption Data, to estimate dietary background exposure of Irish adults to dioxins and PCBs. Furthermore, all available information on the 2008 Irish pork dioxin food contamination incident …
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Understanding and enhancing multi-pollutant control using carbon-based materials
… polychlorinated dibenzo-p-dioxins and -furans (PCDD/F), taking advantage of carbon’s adsorptive and catalytic properties. A simple, one-step technique based on ultrasonic spray pyrolysis was developed to prepare potentially catalytic carbons in a simpler and potentially more sustainable process. …
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Isolation and Identification of Biphenyl and Polychlorinated Biphenyl Degrading Microbes
… aromatics such as polychlorinated dioxin (PCDD) and dibenzofuran (PCDF). As such the purpose of this research is to isolate and test bacterial strains collected from contaminated San Jacinto River sediment and soil for the capacity to degrade or fully metabolize biphenyl and its …
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Geometrical and electronic structure of metal oxide nanoparticles on silica and alumina
… dibenzofurans/dibenzo-p-dioxins (PCDF/PCDD) precursors. X-ray absorption data for the exposed nanoparticles were compared with the unexposed samples to characterize electronic structure and oxidation state during the process. XANES data for the temperature dependent reaction of …
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Sediment Dynamics and Associations with Polychlorinated Biphenyls and Dioxins in an Urban Estuary
… (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 Galveston Bay Estuary …
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The Distribution and Reactivity of Organochlorines in Estuaries
… (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) selected for their persistence, bioaccumulation capacity and toxicity. The aim of this work was to further understanding of the behaviour of these organochlorines (OCs) in estuarine systems. Field …
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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
… of the direct precursors of the most toxic PCDD congener, 2,3,7,8-TCDD, and of 1,2,4,7,8-pentachlorodizenzodioxin, and two additional dimers, from the reaction of 2,4,5-TCP with Fe(III)-montmorillonite clay, which imply that soil contaminated with 2,4,5-trichlorophenol may have the potential …