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首页> 外文期刊>Electroanalysis >Selective Cosmetic Mercury Analysis Using a Silver Ink Screen-Printed Electrode with Potassium Iodide Solution
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Selective Cosmetic Mercury Analysis Using a Silver Ink Screen-Printed Electrode with Potassium Iodide Solution

机译：使用银油墨丝网印刷电极和碘化钾溶液进行选择性化妆品汞分析

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摘要

A new method for selective determination of trace mercury has been demonstrated by linear scan voltammetry using silver ink screen printed electrode (AgSPE) in presence of potassium iodide (KI) dissolved 0.05 M H2SO4 solution. At AgSPE, iodide oxidation peak current signal found to be systematically decreased (inhibitory current anodic peak current signal, i(pa)(in)) with increase in the Hg concentrations, [Hg]. This observation is further utilized for construction of new Hg electroanalytical assays in this work. On the AgSPE, Hg inhibitory detection potential found at 0 V vs. Ag/AgCl, which is 720 mV lower than that of unmodified SPE system. Under optimal experimental conditions, i(pa)(in) signals were linearly increased against [Hg] in the window of 500-4500 ppb (40 mu M KI) with a correlation coefficient (r) of 0.9988. The limit of detection (LOD) and limit of quantification (LOQ) were 98 and 318 ppb, respectively. This approach was further utilized to analyze hidden Hg in the cosmetic samples. Real sample assays were consistent with that of result obtained from ICP-OES, which confirm the applicability of the proposed method for practical applications.
机译：在碘化钾（KI）溶解的0.05 M H2SO4溶液中，采用银丝网印刷电极（AgSPE）的线性扫描伏安法已经证明了一种选择性测定痕量汞的新方法。在AgSPE上，碘化物氧化峰值电流信号发现随着汞浓度[Hg]的增加而有系统地降低（抑制电流阳极峰值电流信号i（pa）（in））。在这项工作中，该观察结果进一步用于构建新的汞电分析方法。在AgSPE上，相对于Ag / AgCl，在0 V时发现的Hg抑制检测电位比未修饰的SPE系统低720 mV。在最佳实验条件下，i（pa）（in）信号相对于[Hg]在500-4500 ppb（40μM KI）的窗口中线性增加，相关系数（r）为0.9988。检测限（LOD）和定量限（LOQ）分别为98和318 ppb。该方法进一步用于分析化妆品样品中的隐藏汞。实际样品测定与从ICP-OES获得的结果一致，这证实了所提出方法在实际应用中的适用性。

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