Solid-phase extraction and determination of trace amounts of lead(II) using octadecyl silica membrane disks modified with a recently synthesized anthraquinone derivative and atomic absorption spectrometry

A simple and fast method for extraction and determination of trace amounts of lead(II) ions using octadecyl-bonded silica membrane disks modified with 1,8-dihydroxy-2,7-bis(prop-1'-enyl)-9,10-anthraquinone and atomic absorpti on spectrometry (AAS) is introduced. Extraction efficiency and the influenc e of flow rates, pH, and type and smallest amount of stripping acid were in vestigated. Maximum capacity of the membrane disks modified with 2 mg of th e anthraquinone derivative used was found to be 255 mg Pb2+. The limit of d etection of the proposed method is 5 mu g/ml. The method is applied to the recovery of Pb2+ from different synthetic samples and a spring water sample . (C) 1999 Academic Press.