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 73 for “"Organic Chemicals"”.
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Cytological effects of certain organic chemicals
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Botany and Plant Pathology, 1952
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Modelling the fate and bioaccumulation potential of organic chemicals in China
An extensive array of chemicals are used in industry and commerce, many produced in large volumes, but their fate in the environment and corresponding exposure to organisms (including humans) has only been measured for a limited number of substances. Modelling tools have been demonstrated to be an …
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Evaluating the natural attenuation of synthetic organic chemicals in a chalk aquifer
ABSTRACT Hydrocarbon contaminants regularly leach into groundwater because of human activities and accidental chemical spills. Here, the contaminants pose a threat to the environment and valuable drinking water resources. Many subsurface environments are able to purify the groundwater of such …
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Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs)
Hydrophobic organic chemicals (HOCs) are a class of environmental contaminants responsible for numerous acute and chronic health effects in humans and wildlife. This thesis illustrates three applications of polyethylene (PE) passive sampling, which enhance our toolbox for estimating environmental …
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Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs)
Hydrophobic organic chemicals (HOCs) are a class of environmental contaminants responsible for numerous acute and chronic health effects in humans and wildlife. This thesis illustrates three applications of polyethylene (PE) passive sampling, which enhance our toolbox for estimating environmental …
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Development of a computational consensus model for the in silico prediction of the skin sensitising potential of organic chemicals in the context of REACH
Die Hautsensibilisierung (Typ 4 Hautallergie) nimmt in der Toxizitätsbewertung einen wichtigen Stellenwert ein, was u.a. daran zu sehen ist, dass sie unter dem europäischen Chemikaliengesetz REACH schon sehr früh, d.h. ab einer Jahrestonne, abgeprüft werden soll. Die Dissertation untersucht, ob die …
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The Battle Creek Health Study: A retrospective cohort study of the health effects of volatile organic chemicals with individual estimate of exposure based on time-modeling
… was found contaminated with a number of volatile organic chemicals. The author conducted a study of the potential health effects of the water contamination. The target was to study all current and former residents of 85 households with contaminated private wells. The final study size was 251 …
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The evaluation and comparison of the extraction procedure toxicity test and the toxicity characteristic leaching procedure for the analysis of municipal wastewater sludges
… Both of these test methods analyze for trace organic chemicals and heavy metals. However, the TCLP is designed to analyze for volatile organic chemicals to a greater extent than the EP. Because of the added complexity and the current expense of the TCLP, the State is concerned that the TCLP …
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Comparison of the extraction procedure toxicity test (EP) and the toxicity characteristic leaching procedure (TCLP) for the analysis of trace organic compounds in land applied municipal wastewater sludges
… (EPA) method utilized for analysis of trace organic chemicals and heavy metals leached from solid waste is the Extraction Procedure (EP) Toxicity Test. Because of various operational problems and limitations of the EP, the EPA has developed and plans to implement the Toxicity Characteristic …
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An investigation into the use of smectitic clay soil for the containment and treatment of petrochemical waste
The manufacture, transport, use and disposal of organic chemicals may result in the release of significant quantities of organic substances into soil, from which they are subject to possible transport into underlying groundwater. Many of these organic chemicals are potentially toxic (Wilson et al., …
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Evaluation of the use of powdered activated carbon for the control of organic compounds during drinking water treatment
… odor, and it is available to remove synthetic organic chemicals (SOCs) that must be controlled to meet drinking water standards. The objective of this study was to show how the adsorptive properties of PAC could more effectively be used in both conventional and unconventional treatment …
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The Characterisation of Oilfield Chemicals by Electrospray Ionization Multi-Stage Mass Spectrometry (ESI-MSᵑ)
A diverse range of polar organic chemicals used during the offshore production of crude oils is routinely discharged from oil production platforms in so-called Produced Water (PW). The environmental fate of these chemicals is largely unknown since few methods exist for their detection. In the …
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Biodegradation of organic contaminants in subsurface systems: kinetic and metabolic considerations
Groundwater contaminated by organic chemicals from industrial spills, leaking underground gasoline storage tanks and landfills has caused concern about the future of a major source of drinking water. Compounds from industrial sources such as alcohols and phenols are frequently found as groundwater …
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Occurrence and fate of endocrine disrupting chemicals and other hydrophobic organic compounds in a tropical river in Kenya
… some endocrine disruptors (EDCs) and hydrophobic organic chemicals (HOCs) in freshwater and sediments of a tropical river in Kenya. PES was applied for the first time for time-integrative sampling of these compound classes and was able to quantify the target compounds at low concentrations that …
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Bioavailability of sediment-sorbed fluorene
The bioavailability of sorbed organic chemicals is a major concern in the application of bioremediation processes to contaminated sediments. Sorption of pollutants may lead to the inability of microbes to come in contact with the compound. Studies presented herein investigate the biodegradation and …
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DEVELOPMENT OF MICROBIAL ELECTROCHEMICAL SENSOR FOR TOXICITY SCREENING OF INFLUENT WASTEWATER
… binary mixtures of heavy metals, cyanide and organic chemicals. Both of the electrochemical and biological characteristics of the sensor were investigated. It was found that neither the viability of bacteria nor the microbial communities was changed due to the short term exposure to the …
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Pharmaceuticals in industrial wastewater and their removal using photo-Fenton’s oxidation
… ground water. In some cases these are persistent organic chemicals which are only partially eliminated during conventional wastewater treatment. They have been detected in the effluent of various European wastewater treatment plants. However, there is a growing body of evidence to suggest that …
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Distribution of ammonium nitrate as nitrogen containing nutrient for in-situ biodegradation by means of electrokinetics
… of specialists for the clean-up of hydrocarbons. Organic chemicals are persistent and hard to deal with, because they are usually present in three forms: dissolved into groundwater, as free product over the groundwater surface, and adsorbed onto soil particles. The requirements for the …
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Separating the Kinetic and Sorption Parameters of Mixed Chlorinated Solvents in Contact with Granular Iron
… barriers (PRBs), is very effective at removing organic chemicals, such as chlorinated solvents and nitroaromatic compounds, from groundwater. In an effort to improve barrier designs, studies have been undertaken to examine the iron surface, as well as the reaction kinetics of granular iron. The …
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