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提出用巯基乙醇为释放剂，选择性螯合滴定法测定合金和矿样中的锡。用EDTA螯合锡（Ⅳ）和其他金属离子，过量EDTA在PH5～6时，用Pb2+标准溶液进行近滴定、XO－MTB－CPB为混合指示剂，终点颜色变化敏锐、清晰。然后加入流基乙醇分解Sn－EDTA螯合物释放出的EDTA，再用Pb2+标准溶液进行滴定，对多种阳阴离子存在的干扰做了研究，一般常见阳阴离子都无影响。
Proposed mercaptoethanol as a release agent, selective chelation titration of the alloy and ore samples of tin. Tin (IV) and other metal ions were chelated with EDTA. The excess EDTA was titrated with Pb2 + standard solution at pH 5-6. XO-MTB-CPB was a mixed indicator with sharp and clear color change at the end. Then adding flow-based ethanol to decompose the EDTA released from the Sn-EDTA chelate, and titrating with Pb2 + standard solution to study the interference of various anions and anions, and generally the common anions have no effect.