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 19 of 19 for “"tetrachloroethylene"”.
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A source of tetrachloroethylene in the drinking water of New England : an evaluation of the toxicity of tetrachloroethylene and the prediction of its leaching rates from vinyl-lined asbestos-cement pipe
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1983.
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A model for the biodegradation of tetrachloroethylene by a mixed aerobic-anaerobic culture immobilized in Ca-alginate
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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ORGANIC ENVIRONMENTAL CONTAMINANTS IN FOOD
… are presented here. Initial studies focused on tetrachloroethylene contamination of food from shops near to and distant from dry cleaning stores. Tetrachloroethylene was detected in butter/lard from all shops near but absent at three of the four distant shops. Chloroform, 1,1,1-trichloroethane …
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Demonstrating the feasibility of polyethylene passive samplers for quantitative assessment of volatile organic compounds in soil
… known amounts of trichloroethylene (TCE) and tetrachloroethylene (PCE). The concentrations of the TCE and PCE were measured using the PE passive sampler and compared to mathematically estimated results. Finally, the PE passive samplers were tested in an actual site at the U.S. Army Cold …
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DEGRADATION OF CARBON TETRACHLORIDE USING HYDROPHOBIC GREEN RUST
… GRBIS and GRSNLS suspended in the organic phase (tetrachloroethylene). Through X-ray diffraction analysis both GRs exhibit similar patterns to Green Rust II, an inorganic form of GR. The kinetics of GR reductive dechlorination of carbon tetrachloride (CT) was investigated. CT at high …
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Zebra GC: A Fully Integrated Micro Gas Chromatography System
… micro]TCD for target analytes: benzene, toluene, tetrachloroethylene, chlorobenzene, ethylbenzene, and p-xylene. Limit of Detection (LOD) of ~1 ng was achieved, which corresponds to 10 min sampling time at a flow rate of 1 mL/min for analyte present at ~25 ppbv concentration. An innovative method …
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Evaluating Competitive Sorption Mechanisms of Volatile Organic Chemical Mixtures in Soils and Sediments Using Polymers and Zeolites
… kinetic profiles for trichloroethylene (TCE) and tetrachloroethylene (PCE), either alone or in a mixture, were measured at 30°C for three natural solids, two polymers, and four zeolites. The polymers and zeolites were used as surrogates for the different sorption environments in natural …
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Chemical Application of Silicon-Based Resonant Microsensor
… resonators. Liquid-phase measurements using tetrachloroethylene as the chemical analyte were performed. The experimental results are discussed, sources of problems are identified and recommendations for future research are made.
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Source identification of trichloroacetic acid with preparative capillary gas chromatography and accelerator mass spectrometry
… location was an atmospheric breakdown product of tetrachloroethylene and not a product of any purported soil microbial process. This result is important for risk assessment procedures performed for TCA and tetrachloroethylene under OECD and EU chemical programs. To control emissions of …
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Adsorption of Pollutants on Charcoal Cloth in Simulated Guard Filters
The removal of toluene, tetrachloroethylene, heptane and o-xylene from air by adsorption on activated charcoal cloth and the subsequent regeneration of the cloth in a stream of hot air was investigated. The above four solvents were chosen as typical organics, due to their less hazardous properties. …
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Exposure to hazardous air pollutants in homes
… ether (MTBE), styrene, trichloroethylene and tetrachloroethylene. Results indicate that Hispanics and non-Hispanic whites had median cumulative cancer risks (CCR) of 520×10-6 and 440×10-6, respectively, for which the main contributors were formaldehyde, p-DCB, acetaldehyde, chloroform and …
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The Microbubble Assisted Bioremediation of Chlorinated Ethenes
… their ability to reductively dehalogenate tetrachloroethylene all the way to ethene and ethane. A continuous flow system, consisting of six anaerobic soil column bioreactors, inoculated with sediments from Virginia Tech's Duck Pond, was used for this study. Two columns received microbubbles …
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Quantification of Parameters in Models for Contaminant Dissolution and Desorption in Groundwater
… of chloroform (TCM), trichloroethylene (TCE) and tetrachloroethylene (PCE) observed during an emplaced-source field experiment conducted within a flow cell (Broholm et al., 1999). In the second study, a methodology was developed for analyzing benzene, toluene, ethylbenzene and xylene (BTEX) data …
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A study of the vapour phase pyrolysis and alkaline hydrolysis of chloroform
… products of the reaction were hydrogen chloride, tetrachloroethylene, pentachloroethane and hexachloroethane; hydrogen and chlorine could not be detected. Neither the addition of a radical initiator (azobisisobutyroni trile) nor an inhibitor (phenol) affected the breakdown, and so we have rejected …
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Adventures in polyene chemistry
… the commercially available starting materials tetrachloroethylene and tributyl(vinyl) stannane. This approach also allows access to a variety of substituted tetravinylethylenes and, as such, represents the first general method of preparation for this family. Tetravinylethylene is smoothly …
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Adventures in polyene chemistry
… the commercially available starting materials tetrachloroethylene and tributyl(vinyl) stannane. This approach also allows access to a variety of substituted tetravinylethylenes and, as such, represents the first general method of preparation for this family. Tetravinylethylene is smoothly …
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Microcosms and field bioremediation studies of Perchloroethene (PCE) contaminated soil and groundwater
… solvents present as contaminants include tetrachloroethylene (PCE, perchloroethene), trichloroethene (TCE), trichloroethane (TCA), and carbon tetrachloride (CT). These chlorinated solvents are problematic because of their health hazards and persistence in the environment, threatening human …
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The Feasibility of Bioaugmentation for the Remediation of Chlorinated Solvents: A Microcosm Study
Chlorinated solvents are among the most prevalent contaminants at Superfund sites. Perchloroethylene (PCE) and its degradative byproducts pose a particular problem because of their persistence in the subsurface and their threat to ecological health. In this study, microcosms were used to test the …