▎ 摘　　要

A simple and selective method using a column packed with graphene oxide (GO) as a solid phase extractant has been developed for the multi-element preconcentration of Fe(III), Ni(II), Cu(II) and Zn(II) ions prior to flame atomic absorption spectrometric determinations. The method is based on the sorption of mentioned ions on synthesized GO using 2-(tert-butoxy)-N-(3-carbamothioylphenyl)acetamide as a chelating agent. Several parameters on the extraction and complex formation were optimized. Under the optimized conditions (pH 6, flow rate 9 mL/min), metal ions were retained on the column, then quantitatively eluted by HNO3 solution (5 mL, 3.0 mol/L). The preconcentration factor was calculated as 250. The detection limits for the analyte ions of interest were found in the range of 0.11 ng/mL (Ni2+) to 0.63 ng/mL (Cu2+). The column packed with GO was adequate for metal ions separation in matrixes containing alkali, alkaline earth, transition and heavy metal ions. (C) 2014 Mohammad Reza Pourjavid. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.