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锡的测定铜合金中锡的测定,过去一般采用古老的偏锡酸重量法进行。上海材料研究所提出的铜合金特快分析中,采用桑色素比色法测定锡。很多工厂采用氟化物释放 EDTA,以铅或锌盐在 pH5～6的条件下进行回滴。此法准确度比较高,但所需时间比较长,还不能更好的满足生产要求。我们根据有关资料介绍,采用以二甲酚橙作络合指示剂,用硝酸钍进行返滴定测定锡,收到了较好的效果。
Determination of tin Determination of tin in copper alloys, the past generally used the ancient method of partial stannous acid gravimetric method. Shanghai Institute of Materials proposed copper alloy express analysis, the use of morin colorimetric determination of tin. Many factories use fluoride to release EDTA, with lead or zinc salt at pH5 ~ 6 under the conditions of the drop. This method is relatively accurate, but the time required for a long time, still can not better meet the production requirements. According to the information we introduced, the use of xylenol orange as a complex indicator, using thorium nitrate back titration tin, received good results.