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在含有SCN~+离子的NH_3-NH_4Cl缓冲溶液或含有Cl~-离子的强酸性溶液中,Cu~(2+)在铂电极示波极谱图(dE/dt～E)上有灵敏切口,可用来指示络合滴定及沉淀滴定的终点。用该法测定了铜铝合金中的铜,滴定结果符合容量分析的要求。改用d~2E/dt~2～E及d~3E/dt~3～E曲线上的切口时,灵敏度更高,较低含量的铜也可准确滴定。定性地比较了几种卤素离子对铜切口灵敏度的影响。
In the NH_3-NH_4Cl buffer solution containing SCN ~ + ions or strong acidic solution containing Cl ~ - ions, Cu ~ (2+) has sensitive incisions on the oscillopolarogram of platinum electrode (dE / dt ~ E) It can be used to indicate the end of complexometric titration and sedimentation titration. This method was used to determine the copper in copper-aluminum alloy. The titration result accords with the requirement of capacity analysis. Use d ~ 2E / dt ~ 2 ~ E and d ~ 3E / dt ~ 3 ~ E curve on the incision, the sensitivity is higher, the lower the amount of copper can be titrated accurately. Qualitatively, the effects of several halogen ions on the sensitivity of copper cuts were compared.