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极谱分析测定锡,方法简便,但选择性差,无法消除铅干扰,更不能同时测定。在水溶液中,用伏安法测定锡,干扰情况不能改善。等人采用难溶盐形式富集锡,提高了选择性,但重现性差。Kiekens和Debacker等人又提出了一些新底液和电极,但锡、铅相互影响还是存在,而且灵敏度也不高。本文提出在HCl-甲醇体系中,以棒状汞膜电极为工作电极,半微分溶出伏安法测定锡,铅不干扰,并可同时测定,获得较为满意的结果。
Polarographic determination of tin, the method is simple, but the selectivity is poor, can not eliminate lead interference, but can not be measured at the same time. In aqueous solution, the voltammetric determination of tin, the interference can not be improved. Et al. Enriching tin with a poorly soluble salt form improves selectivity but poor reproducibility. Kiekens and Debacker and others have proposed some new liquid and electrode, but tin, lead interaction still exists, and the sensitivity is not high. In this paper, we propose to use the mercury electrode as the working electrode in the HCl-methanol system. The semi-differential stripping voltammetry was used to determine tin and lead without interfering with each other. The satisfactory results were obtained at the same time.