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A study on the suitability of carbon disk microelectrodes for trace analysis of lead and copper by ASV

机译：碳盘微电极用于ASV痕量分析铅和铜的适用性研究

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The performance of carbon microdisk electrodes for the simultaneous trace analysis of lead and copper by anodic stripping voltammetry is investigated. The evaluation of the two metal ions in a single step, i.e., by employing a plating potential at which both cations are reduced simultaneously, gives unpredictable results due to the interaction between lead and copper deposited onto the electrode surface. In particular, the calibration plots of lead are not linear, while the copper stripping peak is quite broad and irreproducible. A two-steps deposition procedure, based on a preelectrolysis of copper performed at a potential at which lead ion is not reduced, followed by a simultaneous reduction of the two cations at large enough negative potentials, provides, instead, linear calibration graphs for lead. Copper can be determined without interference by plating the metal at a negative potential where lead ion is not reduced. The reliability of the two-steps procedure for the determination of lend and copper is verified in rain and wine samples. [References: 24]
机译：研究了碳微盘电极通过阳极溶出伏安法同时分析痕量铅和铜的性能。由于在沉积在电极表面上的铅和铜之间的相互作用，在一个步骤中对两种金属离子的评估，即通过采用同时还原两种阳离子的电镀电位，给出了无法预测的结果。特别是，铅的校准图不是线性的，而铜的溶出峰则很宽且不可重现。相反，基于在不还原铅离子的电势下进行的铜预电解，然后在足够大的负电势下同时还原两个阳离子的两步沉积程序，提供了铅的线性校正图。可以通过在不还原铅离子的负电势下电镀金属来确定铜，而不会产生干扰。在雨水和葡萄酒样品中，确定贷款和铜分两步程序的可靠性得到了验证。 [参考：24]

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