Determination of copper in soil by stripping voltammetry based on graphene/nano aluminum oxide modified electrode
LI Xin1, 2, QIN Hao2, CAO Wen-jie1, 2, XU Jun-hui1, 2, WANG Ya-zhen*1, 2
1. Key Laboratory of Optoelectronic Chemical Materials and Devices (Jianghan University),Ministry of Education, Wuhan 430056,China; 2. School of Chemistry and Environmental Engineering, Jianghan University, Wuhan 430056, China
Abstract：A graphene/nano aluminum oxide composite membrane modified glassy carbon electrode was prepared to determine the copper content in soil. The electrochemical behaviors of copper in solution on bare electrode and different modified electrodes were investigated by stripping voltammetry. The experimental conditions were optimized. The results showed that the stripping peak current of copper on composite membrane modified electrode increased by 2.4 times compared to that on bare glassy carbon electrode after enrichment at -0.6V for 12min in disodium hydrogen phosphate-citric acid buffer solution at pH 4.6 (Mc buffer solution). Moreover, the stripping peak current of copper had good linear relationship with its concentration in range of 6×10-9-1×10-5 mol/L. The detection limit was 1×10-9 moL/L. The content of copper in soil sample after microwave digestion was determined using graphene/nano aluminum oxide composite membrane modified electrode. The relative standard deviations (RSD n=6) were less than 5%. The mass fractions of copper in soil sample were between 24.86mg/kg and 36.04mg/kg, indicating that the copper content in soil in this region was at normal level. Meanwhile, the samples were also determined by flame atomic absorption spectrometry (AAS), and the found results were 25.47-35.86mg/kg. Therefore, the proposed method was reliable.
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LI Xin, QIN Hao, CAO Wen-jie, XU Jun-hui, WANG Ya-zhen. Determination of copper in soil by stripping voltammetry based on graphene/nano aluminum oxide modified electrode. , 2017, 37(11): 34-39.
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