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锡酸钠[Na_2SnO_3·3H_2O]是广泛用于电镀方面的重要化工产品,含锡量在35～43％。锡酸钠中含锡量的测定常用重量法和碘酸钾滴定法。重量法结果较稳定、准确,是经典的方法。但手续较繁,时间太长,生产上普遍采用碘酸钾滴定法,此法比前者快速,简单,但测定时在还原和冷却过程中需要在隔绝空气的条件下进行,条件要求较严,操作不易掌握。以NH_4F为解蔽剂的EDTA络合滴定法用于合金中常量锡的测定已有大量报导。但用于锡酸钠的测定还很少有报导。笔者在全面分析了锡酸钠所含主要杂质后,根据EDTA法测
Sodium stannate [Na 2 SnO 3 · 3H 2 O] is an important chemical product widely used in electroplating, with a tin content of 35-43%. Determination of tin content in sodium stannate commonly used gravimetric method and potassium iodate titration method. Gravimetric results more stable and accurate, is the classic method. However, the procedure is complicated and the time is too long. Potassium iodate titration is generally adopted in the production. This method is faster and easier than the former method. However, during the process of reduction and cooling, the measurement needs to be performed under the condition of isolating the air and the conditions are more stringent. Operation is not easy to grasp. The use of EDTA complexometric titration with NH_4F as descrambler has been widely reported for the determination of trace tin in alloys. However, the determination of sodium stannate is still rarely reported. The author after a comprehensive analysis of the main impurities contained in sodium stannate, according to the EDTA method