Cyclodextrin-Modified Solvent Extraction for Polynuclear Aromatic Hydrocarbons

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The extraction efficiencies of several polynuclear aromatic hydrocarbons (PAHs) between Isopropyl ether/water and between Isopropyl ether: 1-butanol (1:4)/water are measured in the presence of an aqueous γ-cyclodextrin (CDx) modifier at room temperature. The distribution of certain PAHs Into the aqueous phase is Increased by the presence of 10-2M γ -cdx. For compounds such as perylene and coronene, which show the most marked effects, the extraction efficiencies Into the aqueous phase from pure Isopropyl ether are 95.1% and 93.7%, respectively, when the CDx modifier Is used. In the mixed solvent system with 1-butanol, these values are 63.4% and 98.1 %, respectively. In both systems, the Increased distribution into water is based in part on the size relationship between the PAH and the CDx cavity. In the case of relatively small molecules like anthracene, little or no extraction Is observed in the presence of the CDx modifier. This type of extraction system may be useful for selective extraction of large PAHs from mixtures. Extraction results for a variety of PAHs are presented and discussed. © 1988, American Chemical Society. All rights reserved.

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Analytical Chemistry

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