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提出了在Fe(Ⅲ ) -EDTA -ClCH2 COOH -NaOAc缓冲溶液中利用电生Fe(Ⅱ ) -ED TA络合物精密库仑滴定Au的方法。采用电位法检测终点 ,测定范围在 5 2～ 1 7 0mgAu时 ,相对平均误差和标准偏差≤ 0 0 3%。方法可用于纯金、金合金和首饰等材料中Au含量的精密分析 ,选择性很好。讨论了电生Fe(Ⅱ ) -EDTA络合物作库仑滴定剂的理论基础 ,获得了有益的结论。
The method of precise Coulometric titration of Au in Fe (Ⅲ) -EDTA-ClCH2 COOH-NaOAc buffer solution by Fe (Ⅱ) -EDTA complex was proposed. The end point was detected by potentiometric method. The relative average error and standard deviation were less than or equal to 0 0 3% when the measurement range was 52 ~ 170 mg Au. The method can be used for precise analysis of Au content in pure gold, gold alloy and jewelry materials with good selectivity. The theoretical basis of coulometric titration of the electro-generated Fe (Ⅱ) -EDTA complex was discussed, and some useful conclusions were obtained.