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铜合金中锡的测定有比色法及络合滴定法等。锡的极谱催化波已见文献报道的体系,铜与铅等离子共存均有严重干扰,难以适应铜合金中锡的分析要求。本文研究了锡在醋酸铵—铜铁试剂(Hcup)—吐温体系中的极谱行为,在此体系中控制一定的pH值,大量铜与铅共存不影响锡的测定,成功地应用于纯铜、黄铜及锡青铜等试样中锡的分析。本方法测定试液中锡的浓度在ppb级
Determination of tin in copper alloys with colorimetric and complexometric titration. The polarographic catalytic wave of tin has been reported in the literature. The coexistence of copper and lead ions all seriously interfere with the analysis of tin in copper alloys. In this paper, the polarographic behavior of tin in the Hcup-Tween system was studied. In this system, a certain pH value was controlled. The coexistence of a large amount of copper and lead did not affect the determination of tin, and was successfully applied to pure Analysis of tin in copper, brass and tin bronze samples. The method determines the concentration of tin in the test solution in the ppb level