Preconcentration and Determination of Copper(II) Using Octadecyl Silica Membrane Disks Modified by 2-Propylpiperidine-1-carbodithioate and Flame Atomic Absorption Spectrometry

A simple and fast method for extraction and determination of trace amounts of copper(II) ions using octadecyl-bonded silica membrane disks modified with 2-propylpiperidine-1-carbodithioate (PPCD)I and atomic absorption spectrometry (AAS) is introduced. Extraction efficiency and the influence of flow rates, pH, and type and smallest amount of stripping acid were investigated. Maximum capacity of the membrane disks modified with 2 mg of the anthraquinone derivative used was found to be 425μg Cu²⁺. The limit of detection of the proposed method is 7 ng/ml. The method is applied to the recovery of Cu²⁺ from different synthetic samples and a spring water sample