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锡合金中锡的测定一般采用碘量法和络合滴定法.碘量法测锡系一经典方法.但干扰元素较多,手续较长.络合滴定法测锡有钍盐回滴法和解蔽滴定法.钍盐回滴法铋干扰测定,而且钍盐昂贵,成本甚高.解蔽滴定法选择性较高,但目前使用的各种解蔽剂都不能完全消除铝的干扰.采用氟化物为解蔽剂,铝定量干扰测定.有资料用乳酸或没食子酸为解蔽剂,铝不干扰测定.试验表明,铝的存在仍使锡的结果偏高,而且解蔽速度缓慢,滴定终点不明显.而用乙酰丙酮掩蔽铝,我们试验
The determination of tin in tin alloys is generally based on the iodometric method and the complexometric titration method.The iodine method is a classical method for the determination of tin, but there are more interfering elements and longer procedures. Lithium Thionate back-drop method interference determination of bismuth, and thorium salt expensive, high cost. Unmasking titration selectivity higher, but the use of a variety of anti-scavengers can not completely eliminate the interference of aluminum. Materials for the anti-scavenger, quantitative determination of aluminum interference.Some information with lactic acid or gallic acid as the scavenger, aluminum does not interfere with the determination.Experiments show that the presence of aluminum still results in high tin, but also slow down the slow, titration end point Obvious, while using acetylacetone masking aluminum, we test