Preconcentration and Determination of Copper(II) Using Octadecyl Silica Membrane Disks Modified by 1,5‐Diphenylcarhazide and Flame Atomic Absorption Spectrometry

Abstract

AbstractA simple and reproducible method for the rapid extraction and determination of trace amounts of copper(II) ions using octadecyl‐bonded silica membrane disks modified by 1,5‐diphenylcarbazide (DPC) and atomic absorption spectrometry was presented, which was based on complex formation on the surface of the ENVI‐18 DISKTM disks followed by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution was efficient and quantitative. The effect of potential interfering ions, pH, ligand amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break‐through volume was found to be about 1000 mL providing a preconcentration factor of 400. The maximum capacity of the disks was found to be (255±5) µg for Cu2+, and the limit of detection of the proposed method was 5 ng per 1000 mL. The method was applied to the extraction and recovery of copper in different water samples.