锡及锡铅合金的测定方法文献多采用返滴定法及置换滴定法。按文献方法,对高纯锡及锡铅合金进行多次测定,测得结果偏低,误差较大。从实验中观察到:当加入(CH_2)_6N_4调pH=5—6时,便产生浑浊或沉淀。这一现象与锡易水解的性质是一致的。即无论是Sn~(2+) Determination of tin and lead-lead alloy literature and more use of back-titration and replacement titration. According to the literature method, the determination of high-purity tin and tin-lead alloy was carried out several times, the measured results were low and the error was relatively large. It is observed from the experiment that when adding (CH_2) _6N_4 to adjust pH = 5-6, it will produce turbidity or precipitation. This phenomenon is consistent with the nature of tin hydrolysis. That is, whether Sn ~ (2+)