我们曾用甲基橙控制还原终点和消除过量二氯化锡的方法代替汞盐,经一阶段实践,认为是可行的,尤其对二氯化锡还原铁时黄色消退不易辨认的样品,确有其优点。在一般情况下,可改进成与有汞测铁操作完全一样,只有加高汞改成加甲基橙即可,与前一操作相比,元素干扰情况有所改善。本文探讨了对过量二氯化锡反使结果偏低的现象及其消除办法。在此期间,湖北省地质实验室化二组对本法也作了进一步研究,并作了某 We used methyl orange to control the reduction of the end point and the elimination of excessive stannic chloride instead of mercury salt, which was considered as feasible after a period of practice. In particular, when tin dichloride was used to reduce iron, Its advantages. In general, it can be improved to be exactly the same as for mercury-based iron measurement, with only elevated mercury replaced with methyl orange, which has shown an improvement in elemental interference compared to the previous operation. This article explores the phenomenon of overdosing tin dichloride and its elimination. During this period, the second group of Geological Laboratory of Hubei Province made further research on this Law and made a