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首页> 外文期刊>International journal of environmental analytical chemistry >Determination of cobalt by adsorptive stripping voltammetry with double accumulation and stripping steps
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Determination of cobalt by adsorptive stripping voltammetry with double accumulation and stripping steps

机译：吸附溶出伏安法测定钴的两次富集和溶出步骤。

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摘要

A double accumulation and stripping steps were proposed to increase the sensitivity of Co(II) determination by catalytic adsorptive stripping voltammetry (AdSV). Electrodes with large and small surface area were used for the first and second accumulation step, respectively. As the accumulation of Co(II) complex at the first electrode was finished, the electrode was placed at a short distance opposite the second one. Then the Co(II) complex desorbed from the first electrode was accumulated at the second electrode. Taking into account the small volume of space between the electrodes, the concentration of the Co(II) complex in solution between the electrodes was drastically higher than that in the bulk solution. The accumulation step at the second electrode was performed from the solution with higher concentration of Co(II) and therefore the detection limit was lowered. The calibration graph of Co(II) determination for accumulation time of 120s at both electrodes was linear from 1.18 to 58.9ngL(-1). The detection limit for Co(II) was equal to 0.47ngL(-1) and it is so far the lowest detection limit obtained for Co(II) using mercury-free electrodes. The proposed method was applied to Co(II) determination in water certified reference material.
机译：提出了一种双重积累和汽提步骤，以提高通过催化吸附溶出伏安法（AdSV）测定Co（II）的灵敏度。具有大和小表面积的电极分别用于第一和第二累积步骤。随着第一个电极上Co（II）络合物的积累完成，将电极放置在与第二个电极相对的较短距离处。然后，从第一电极解吸的Co（II）络合物在第二电极处累积。考虑到电极之间的空间很小，电极之间溶液中Co（II）配合物的浓度大大高于本体溶液中的浓度。从具有较高浓度的Co（II）的溶液中进行第二电极处的累积步骤，因此降低了检测限。 Co（II）测定两个电极上120s累积时间的校准图在1.18至58.9ngL（-1）之间呈线性关系。 Co（II）的检出限等于0.47ngL（-1），是迄今为止使用无汞电极获得的Co（II）的最低检出限。拟议的方法用于水认证的参考材料中Co（II）的测定。

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