Cyclodextrin-modified solvent extraction for polynuclear aromatic hydrocarbons
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 ..gamma..-cyclodextrin (CDx) modifier at room temperature. The distribution of certain PAHs into the aqueous phase is increased by the presence of 10/sup -2/ M ..gamma..-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.
- Research Organization:
- Emory Univ., Atlanta, GA (USA)
- OSTI ID:
- 6661307
- Journal Information:
- Anal. Chem.; (United States), Vol. 60:19
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BUTANOLS
SOLVENT PROPERTIES
DEXTRIN
ISOPROPYL ETHER
POLYCYCLIC AROMATIC HYDROCARBONS
SOLVENT EXTRACTION
WATER
EXPERIMENTAL DATA
MEDIUM TEMPERATURE
ALCOHOLS
AROMATICS
CARBOHYDRATES
DATA
ETHERS
EXTRACTION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
POLYSACCHARIDES
SACCHARIDES
SEPARATION PROCESSES
400105* - Separation Procedures