Solid phase extraction of ultra trace copper(II) using octadecyl silica membrane disks modified by a naphthol-derivative Schiff's base

A simple and reliable method for the rapid extraction and determination of ultra trace amounts of copper(If) ions using octadecyl-bonded silica membra ne disks modified by a recently synthesized Schiff's base (2,2'-[1,2-ethane diyl bis(nitriloethylidyne)] bis(1-naphthalene)) and atomic absorption spec trometry is presented. Extraction efficiency and the influence pH, nature a nd amount of counter anion, flow rates and type of stripping acid were eval uated. The capacity of the membrane disks modified by 5 mg of the ligand wa s found to be 396 mu g of copper. The limit of detection of the proposed me thod is 4 ng pet 1000 mi. The method was applied to the extraction and reco very of copper in different water samples. (C) 2000 Elsevier Science B.V. A ll rights reserved.