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Determination of trace of iodide at a poly-l-methionine modified glassy carbon electrode

Xu LIU, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China, Hui GAO, Dengming SUN, Yanming WANG, Wei MA, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China, Information School, Huaibei Normal University, Huaibei, Anhui 235000, China, Information School, Huaibei Normal University, Huaibei, Anhui 235000, China
2019 Revue roumaine de chimie  

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This work developed a highly simple and sensitive voltammetric method for accurate determination of trace iodide using poly-L-methionine modified glassy carbon electrode. The oxidation current of iodide at the modified electrode was found to be more higher than that at the bare GCE, which was attributed to the ion exchange capacity of L-methionine. The electrocatalytic oxidation response of iodide at this modified electrode has been investigated by various voltammetry methods including cyclic
more » ... ltammetry, anodic stripping voltammetry and differential pulse voltammetry. Applying the optimal differential pulse voltammetry conditions, the oxidation current of iodide increased linearly from 2.50×10 -6 to 1.00×10 -3 mol L -1 with a detection limit of 8.0×10 -7 mol L -1 (at an S/N of 3). In addition, other performance of the electrode including the reproducibility, stability, and anti-interference ability were excellent. Finally, the present method has been applied to quantify the iodide in table salt samples with satisfactory results.
doi:10.33224/rrch/2019.64.4.03 fatcat:bwc3lftssvb3zpou7ogdv6veq4
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Xu LIU, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China, Hui GAO, Dengming SUN, Yanming WANG, Wei MA, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China, Information School, Huaibei Normal University, Huaibei, Anhui 235000, China, Information School, Huaibei Normal University, Huaibei, Anhui 235000, China. "Determination of trace of iodide at a poly-l-methionine modified glassy carbon electrode." Revue roumaine de chimie 64.4 (2019) 311-316