title: Extraction and determination of crown ethers from water samples using a membrane disk and gas chromatography.
abstract: A method for rapid extraction and determination of some crown ethers in aqueous matrices using octadecyl-bonded silica membrane disks and gas chromatography is presented. Extraction efficiency and the influence of vacuum pressure. pH, and type and least amount of eluting solvent used to extract the crown ethers from the membrane disks were evaluated. Extraction efficiencies > 95% were obtained for benzo-15-crown-5, benzo-18-crown-6 and dicyclohexyl-18-crown-6 using 5 ml of acetonitrile as eluting solvent. The limit of detection of the proposed method for the determination of the crown ethers is reported.
authors.affiliation: Department of Chemistry. Tarbiat Modarres University, Tehran, Iran.
authors.forename: Y
authors.initials: Y
authors.lastname: Yamini
authors.forename: M
authors.initials: M
authors.lastname: Shamsipur