锡广泛用于钢铁工业、陶瓷工业、塑料工业、电子工业、宇宙航行以及罐头食品工业、印刷工业和电气工业等领域。随着生产的发展,对于锡的测定提出了新的要求。近十年来,锡的分析技术有了很大的进展。一、容量法近十年来,在锡的碘量法分析中做了很多工作。大量实践进一步认识了干扰碘量法反应中的若干元素。在砷的干扰问题上,云南锡业公司作了较为细致的工作。从若干现象发现和推理在铝还原和铁粉还原过程中,砷呈As°、H_3As、As~(3+)和As~(5+)的形态存在。其中:As~(8+)不消耗碘液,H_3As挥发逸去不干扰测定(但有毒!);As~(5+)存在的比例不大,但氧化碘化钾析出碘,严重地造成结果偏低;As°呈分散状态过细的粒子,可能少量溶解于盐酸而消耗碘液,因而表现为随加入砷量 Tin is widely used in the steel industry, ceramic industry, plastic industry, electronics industry, aerospace and canned food industry, printing industry and electrical industry and other fields. With the development of production, new requirements have been put forward for the determination of tin. Over the past decade, tin analysis technology has made great progress. First, the capacity method In the past decade, a lot of work has been done in the tin iodometric analysis. A lot of practice to understand a number of interference in the reaction of iodine number of elements. On the issue of arsenic interference, Yunnan Tin Company made a more detailed work. From a number of phenomena found and reasoning in the reduction of aluminum and iron reduction, arsenic was As °, H_3As, As ~ (3 +) and As ~ (5+) morphology. Among them, As ~ (8+) did not consume iodine, H_3As did not interfere with the volatilization of the assay (but toxic!); As ~ (5+) did not exist in a large proportion, ; As ° was too fine dispersion state particles may be dissolved in a small amount of hydrochloric acid consumption of iodine, which showed the amount of added with arsenic