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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 HNO3solution(5 mL,3.0 mol/L).The preconcentration factor was calculated as250.The detection limits for the analyte ions of interest were found in the range of 0.11 ng/mL(Ni2+) to0.63 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.
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) 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. formation were optimized.Under the optimized conditions (pH 6, flow rate 9 mL / min), the metal ions were retained on the column, then quantitatively eluted by HNO3solution (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.