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首页> 外文会议>Workshop on Macro, Trace and Ultratrace Elements; 20040924-25; Jena(DE) >Determination of selenium (Ⅳ) by stripping voltammetry on a copper-doped mercury film electrode
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Determination of selenium (Ⅳ) by stripping voltammetry on a copper-doped mercury film electrode

机译：铜掺杂汞膜电极上溶出伏安法测定硒（Ⅳ）

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摘要

The need to measure the concentration of Se in food, environmental objects etc is well-known. The stripping voltammetry is one of the commonly used methods for that. In some processes Se is accumulated in the form of a hardly soluble compounds in the presence of a suitable metal ions, normally copper. Cu~(2+) + 2e +Hg → Cu~0(Hg) (1) SeO_3~(2-) + xCu(Hg) + 6H~+ + 4e → Cu_xSe(Hg) + 3H_2O (2) The electrochemical reduction of the precipitate thus obtained results in the formation of the charachteristic peak on the voltammogram, its height being proportional to the concentration of Se in the solution: Cu_xSe(Hg) + 2H~+ + 2e → H_2Se + xCu(Hg). (3) Good sensitivity and reproducibility were found for the case of the mercury drop electrode only so far. The use of the mercury film electrode results in the considerably worse metrological characteristics of the analysis (Lange and Scholz 1997). The present work aims at the development of the method of Se (Ⅳ) determination by stripping voltammetry on the the mercury drop electrode, pre-doped with Cu, which was not done so far.
机译：众所周知，需要测量食物，环境物体等中硒的浓度。溶出伏安法是常用的方法之一。在某些过程中，在合适的金属离子（通常是铜）存在下，Se以难溶化合物的形式积累。 Cu〜（2+）+ 2e + Hg→Cu〜0（Hg）（1）SeO_3〜（2-）+ xCu（Hg）+ 6H〜+ + 4e→Cu_xSe（Hg）+ 3H_2O（2）电化学还原如此获得的沉淀的沉淀导致在伏安图上形成特征峰，其峰高与溶液中硒的浓度成正比：Cu_xSe（Hg）+ 2H〜+ + 2e→H_2Se + xCu（Hg）。 （3）到目前为止，仅对于汞滴电极，发现了良好的灵敏度和可重复性。汞膜电极的使用导致分析的计量学特性大大降低（Lange and Scholz 1997）。本工作旨在开发一种通过溶出伏安法在预先掺杂有Cu的汞滴电极上进行溶出伏安法测定Se（Ⅳ）的方法，目前尚未完成。

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