Journal
ANALYTICA CHIMICA ACTA
Volume 477, Issue 1, Pages 93-101Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0003-2670(02)01411-3
Keywords
solid-phase extraction; beta-cyclodextrin epichlorohydrin copolymer; aromatic compounds; GC-MS
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A novel solid-phase extraction (SPE) procedure for trace aromatic compounds in water samples has been developed using 12 aromatic compounds as model compounds and GC-MS and UV spectrophotometry for detection. The method is based on the fact that beta-cyclodextrin (beta-CD) epichlorohydrin (ECH) copolymer (beta-CDEP) can extract non-ionized aromatic compounds quantitatively from aqueous samples. The polymer used is a colorless, transparent and insoluble solid with a maximum capacity of 0.82 mumol aromatic compounds per gram. It was synthesized by co-polymerization of beta-CD and ECH and characterized by FT-IR and UV. beta-CDEP does not contain double bonds, and therefore it does not have appreciable absorbance in the UV region. The optimum pH range for the extraction of aromatic compounds is 2.5-5.0. The method has high extraction efficiency with the recoveries between 90 and 101% for aromatic compounds at 0.02-1.67 ppm levels, and the analytes can be easily eluted by methanol washing after preconcentration. (C) 2002 Elsevier Science B.V. All rights reserved.
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