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提出了间接测定1—10mg金(Ⅲ)的简便电势滴定法。在1,10—菲绕啉或2,2′—联吡啶存在下,在pH3和50℃情况下用过量钴(Ⅱ)将金(Ⅲ)还原为金属,然后用氯化铁(Ⅲ)溶液滴定过量的钴(Ⅱ)络合物。许多金属离子可以允许存在;Ag(Ⅰ)和Pd(Ⅱ)分别用氯化钠和1,10—菲绕啉或2,2′一联吡啶沉淀而除去。但是Hg(Ⅱ),Fe(Ⅲ)和Pt(Ⅳ)干扰。此方法能用于合金中金的测定。
A simple potentiometric titration method for the indirect determination of gold (Ⅲ) from 1 to 10 mg was proposed. Gold (III) is reduced to metal with excess cobalt (II) in the presence of 1,10-phenanthroline or 2,2’-bipyridine at pH 3 and 50 ° C and then treated with iron (III) Titration of excess cobalt (II) complex. Many metal ions are allowed to exist; Ag (Ⅰ) and Pd (Ⅱ) are respectively removed by precipitation with sodium chloride and 1,10-phenanthroline or 2,2’-bipyridine. However, Hg (Ⅱ), Fe (Ⅲ) and Pt (Ⅳ) interfere with each other. This method can be used for the determination of gold in alloys.