A Simple and Sensitive Voltammetric Method for the Determination of Orange II Based on a Functionalized
Yudong Gao1, Zhengkun Xie1, Yulong Zhang1
1Zhengzhou University, College of Chemistry and Molecular Engineering, Zhengzhou 450001, China.
Abstract:
A simple and sensitive voltammetric sensor for Orange II was developed, based on a poly(sodium p-styrenesulfonate)-functionalized graphene-modified glassy carbon electrode. This voltammetric sensor showed strong accumulation ability and an excellent voltammetric response for Orange II. The electrochemical behavior of Orange II was systematically investigated in a pH 7.0 phosphate buffer solution. By linear sweep voltammetry, under optimum conditions, a good linear relationship was obtained between peak currents and Orange II concentrations in the wider range of 3 × 10(-8) to 5 × 10(-6) mol/L, with an LOD of 1 × 10(-8) mol/L. In addition, the proposed Orange II sensor was successfully applied to real food samples with satisfactory recovery.
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