Supercritical fluid extraction of organics in rocks and urban dust and identification of organic compounds in sewage sludge products and soils.
Item
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Title
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Supercritical fluid extraction of organics in rocks and urban dust and identification of organic compounds in sewage sludge products and soils.
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Identifier
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AAI9530932
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identifier
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9530932
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Creator
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Yang, Hong.
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Contributor
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Adviser: David C. Locke
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Date
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1995
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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 | Engineering, Electronics and Electrical | Chemistry, Organic
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Abstract
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A supercritical fluid extraction (SFE)/chromatography method was developed for the analysis of hydrocarbons and nitrated polycyclic aromatic hydrocarbons in solid environmental samples. A systemic study for the extraction conditions was performed including extraction pressure, temperature, time, effect of the addition of modifiers, and collection efficiencies. Quantitative extraction of C{dollar}\sb{12}{dollar} to C{dollar}\sb{lcub}32{rcub}{dollar} alkanes (recovery {dollar}\leq{dollar} 90%) was obtained at 8000 psi, 99{dollar}\sp\circ{dollar}C for 20 min extraction. The addition of 10 mol% hexane or toluene improved the extraction efficiency. Six rock samples were extracted at optimum SFE conditions and C{dollar}\sb{14}{dollar} to C{dollar}\sb{lcub}24{rcub}{dollar} were identified. The optimum extraction conditions for nitrated polycyclic aromatic hydrocarbons were at 8500 psi, 99{dollar}\sp\circ{dollar}C for 25 min. The addition of 10 mol% of methanol or acetone improved the extraction efficiency. 1-Nitro-pyrene, 6-, and 7-nitro-benzocoumarin were identified in NIST SRM 1649 urban dust sample. SFE was compared with Soxhlet extraction. Compared with Soxhlet extraction, SFE is a quicker, simpler and safer extraction method.;The identification of organic compounds in the sewage sludge products is important for the evaluation of sludge utility. GC-MS and HPLC were used for the identification of organic compounds in complex New York sewage sludge products and soil samples. The most numerous compounds identified were petroleum hydrocarbons. PAHs, phenols, phthalate esters, fatty acids and some cholesterol derivatives were also identified. The sources of the compounds were discussed. Semiquantitative results and total organic carbon in the samples were tested.
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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.
