Supercritical fluid extraction of toxic organics from soils.
Item
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Title
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Supercritical fluid extraction of toxic organics from soils.
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Identifier
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AAI9029919
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identifier
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9029919
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Creator
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Cai, Jane Yizhi.
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Contributor
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Adviser: David C. Locke
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Analytical | Environmental Sciences
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Abstract
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Supercritical fluid (SCF) extraction of six representative pesticides and two polychlorinated biphenyls (PCBs) from four types of soil samples was investigated in comparison with the conventional Soxhlet extraction technique. Supercritical carbon dioxide, nitrous oxide, and modified carbon dioxide were employed as the extraction fluids. The pesticides and PCBs include aldrin, parathion, malathion, 2,4-D methyl ester, amitrol, aldicarb, and Aroclors 1254 and 1260. The soil samples including sand, loam, top-soil and clay with various grain sizes were spiked with the pesticides or PCBs at a variety of spiking levels (e.g. from ca. 1 ng to ca. 1 mg per gram of soil sample). The extraction conditions were optimized. The extracts were analyzed by gas chromatography or by high performance liquid chromatography.;In general, the supercritical fluid extractions (SFE) of most of the compounds studied give satisfactory ({dollar}>{dollar}80%), and in many cases quantitative ({dollar}>{dollar}95%), recoveries. All the results demonstrated that the SFE of the pesticides and PCBs except amitrol presents a superior method over the conventional Soxhlet extraction. (Abstract shortened with permission of author.).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
