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 16 of 16 for “"chlorophenols"”.
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Degradation of Chlorophenols in Swine Waste
… of bioremediation research. In this study, chlorophenols were extracted by SPME and analysed by GC. This research project mainly focused on the anaerobic degradation of chlorophenols in swine waste. It was observed that the decreased concentration of the chlorophenols was likely due to …
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Factors affecting binding of chlorophenols to soil
Synthetic substituted phenols can become incorporated into soil organic matter by processes similar to natural humification. Biological, (enzyme-catalyzed), and abiotic, (mineral surface catalyzed), reactions have been implicated in these processes which result in the nonextractable binding of …
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Adsorption and dechlorination of chlorophenols under acidogenic conditions
… of chlorine at the ortho position. At times when chlorophenols were not dechlorinated, they were still removed from the wastewater via adsorption onto the acidogenic sludge. Overall, acidogenic biotreatment was shown to be a viable pretreatment process for these chlorinated compounds in preventing …
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Investigation of the Interactions Among Grass, Chlorophenols and Microbes
… to explore the interactions among rye grass, chlorophenols and microorganisms. The objectives were to examine some of the processes by which plants affect the fate of subsurface organic contaminants. The research was divided into three studies: interactions between live grasses and …
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Effect of organic matter and contact time on the sorption and bioavailability of chlorophenols
Chlorophenols represent a class of organic contaminants that are commonly used and widely distributed in the environment. Adsorption to soils may inhibit the transport of these chemicals, while slow desorption rates can create a potential source for long-term contamination of groundwater supplies. …
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Evaluation of a mitochondrial test for the determination of chemical toxicity
… were exposed to six concentrations of five chlorophenols. Respiratory parameters were measured and compared to control experiments. The toxicity of the chlorophenos, measured by the 50% uncoupling concentration (UC50), increased with increasing chloro substitution. The UC50 values for the …
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Aplicación de técnicas quimiométricas a la resolución de señales electroquímicas solapadas
… and the other one, organic, constituted by four chlorophenols: 4 methyl-3-chlorophenol (MF), 4-chlorophenol (CF), 2,4-dichlorophenol (DCF) and 2,4,6-trichlorophenol (TCF). Both systems were studied with amperometric electrochemical sensors: the hanging mercury drop electrode, for the inorganic …
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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
Clay 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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An Immobolized Surfactant Extraction Technique Compatible with High Performance Liquid Chromatography-Ultraviolet Visible Detection
… of this procedure was tested using seven chlorophenols as trace samples. The recoveries for selected chlorophenols were as high as 90 percent. The detection limits were as low as 10-parts-per billion. The effect of water hardness on the extraction efficiency was also investigated. The …
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Physiological Characterization of Acetotrophic Anaerobic Respiration Using Anaeromyxobacter Dehalogenans as a Model Organism
… auxiliary energy to alleviate the toxicity of chlorophenols. Furthermore, the distinctive ability of A. dehalogenans to oxidize acetate in anaerobic respiration with diverse electron acceptors was investigated using biochemical and molecular approaches. Biochemical studies revealed …
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Formation of Chloroform and Other Chlorinated Byproducts by the Chlorination of Antibacterial Products
… triclosan ratios tend to form higher amounts of chlorophenols and (chlorophenoxy)phenol intermediates. The results from this study suggest that the chloroform produced by these reactions can be substantial under some conditions.
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Thermochemistry and kinetics in pyrolysis and oxidation of oxygenated chlorocarbons and chlorinated aromatics
… monochlorobenzene to hexachlorobenzene, and all chlorophenols from ortho-, meta-, para-chlorophenol to pentachlorophenol. The B3LYP/6-31G(d,p) method is used in the structure optimization. The B3LYP/6-31G(3df,2p), QCISD(T)/6-3 I G(d,p), and CB S-Q methods are used in single point calculations of …
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The chemistry of chlorine in combustion systems and the gas-phase formation of chlorinated and oxygenated pollutants
… and toxic compounds, such as chlorobenzenes, chlorophenols, and polychlorinated dioxins, furans and biphenyls. AH of these pollutants are regulated by US-EPA emission standards. This research studies the conditions which favor the gas-phase formation of these chlorinated byproducts. Under …
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Characterisation and fate of bleached kraft mill effluents from a New Zealand pulp and paper mill
… also differed. System A was unable to remove chlorophenols and chloroguaiacols while system B did not reduce levels of chlorocatechols. The removal of AOX from effluents treated in system A was high compared to published data and an assessment was made of possible mechanisms for the observed …
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Influence of pH and NOM on Sorption of Phenols onto Aquifer Material
… reported by Ohlenbusch and Frimmel, 2001, for chlorophenols associated with Aldrich humic acid. This can be interpreted as a result of specific interactions between the nitrophenol and DHS. This phenomenon may cause an increase of the amount of nitrophenols, which can be transported with the …
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The Mechanisms, Products, and Kinetics of Triclosan-Free Chlorine Reactions
The kinetics, products, and reaction pathways of triclosan/free chlorine reactions were investigated for the pH range 3.5-11. Although pH dependent speciation occurs in both triclosan and free chlorine, only the reaction between HOCl and the phenolate-triclosan was found to play a significant role …