【摘要】 在ｐＨ为１０３的氯化铵氨水底液中，使氰化物与Ｎｉ２＋离子形成稳定物〔Ｎｉ（ＣＮ）４〕２－络离子，过量的Ｎｉ２＋离子用标准ＥＤＴＡ溶液返滴，以Ｎｉ２＋离子在交流示波极谱图上的切口消失指示滴定终点，废水的色度、浊度等对测定不产生干扰，无须进行预蒸馏处理，操作简便，快速。方法的相对偏差小于１０％，变异系数小于０７％，水样的加标收率为９６～１０７％。更多还原

【Abstract】 In NH 3 NH 4Cl base solution at pH 10 3,cyanide and Ni 2+ ions can form complex ions,and the excess standard solution of Ni 2+ ions is back titrated with standard solution of EDTA.Ni 2+ gives a sharp incission on its oscillopolarogram,and the disapperance of the incission on the curve can be used to indicate end point.The color and turbidity of the sample needs no predistillation.The process is very simple and rapid.The relative deviation and variation coeffitient and below 1 0% and 0 7%,respectively.The recovery was determined to be 96 0～107%.更多还原