Simultaneous Solid Phase Chelate Extraction for Ultratrace Determination of Copper, Nickel, and Zinc by Microsample Injection System Coupled Flame Atomic Absorption Spectrometry

Abstract

A simple and accurate solid phase extraction method was developed for the determination of Cu(II), Ni(II), and Zn(II) at trace levels by microsample injection system coupled flame atomic absorption spectrometry. The proposed method is based on the retention of complexes of metal ions with 4-(2-pyridylazo) resorcinol on Amberlite XAD-7 resin and elution with acetone. The possible parameters influencing the preconcentration were optimized. The interferences of coexisting ions were studied. Under the optimal conditions, the detection limits of Cu(II), Ni(II), and Zn(II) were 0.058, 0.013, and 0.027 µg L-1, respectively. The applicability and the accuracy of the proposed method were validated by analysis of BCR 715 wastewater as a certified reference material and spiked real samples. Recoveries in the range of 94-105% were obtained with relative errors less than 7.5% and relative standard deviations less than 3.2%. © 2013 Copyright Taylor and Francis Group, LLC.