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锡、铅在受扩散控制的多数底液中,极谱波是重迭的,虽然近年来,一些作者对锡、铅波分离的底液进行过研究,并用于锡,铅的连续测定,但两元素的浓度比仍然较窄,条件要求严格,灵敏度不高;在提高灵敏度方面,有人提出了盐酸—氯化四苯砷体系,并应用于钢中少量锡的测定;高小霞等提出四价钒催化体系,并引入碘化钾体系用于生产实际中,近来又有人提出在草酸—亚甲蓝和氨—氯化铵体系的伏安法,使灵敏度得到进一步的提高,但这些方法有的受到铅的影响,有的受到催化剂的影响,有的流程过于繁琐,温度系数影响大等,存在一些缺点。
Tin, lead Most of the diffusion-controlled base fluids have polarographic waves that overlap, although in recent years some authors have studied the separation of tin and lead waves and have been used in the continuous determination of tin and lead but, The concentration ratio of two elements is still narrow, the conditions are demanding, the sensitivity is not high; in improving the sensitivity, it was proposed hydrochloric acid - chlorinated benzene four arsenic, and used in the determination of a small amount of tin in steel; Gao Xiaoxia et al proposed tetravalent vanadium Catalysis system, and the introduction of potassium iodide system for the production of the actual, and recently it was proposed in the oxalate - methylene blue and ammonia - ammonium chloride system, the sensitivity has been further improved, but some of these methods are subject to lead Influence, and some are affected by the catalyst, and some processes are too cumbersome, the temperature coefficient of large, there are some shortcomings.