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研究了铑的阳极伏安测定法。Rh(Ⅲ)在碱金属氢氧化物溶液中生成的黄色 Rh(OH)_6~3-离子,于0～+0.5伏(对 SCE)电位范围里,在旋转铂电极上产生良好的氧化波。半波电位约为+0.32伏。伏安曲线的对数分析、恒电位电解以及用标准铈(Ⅳ)溶液安培滴定 Rh(Ⅲ)等实验获得的结果表明,在铂电极上氧化为 Rb(Ⅳ)的氧化波,是遵从扩散控制的可逆波。加入柠檬酸钠可使铱的允许量增加。用本法测定了若干铑、铱分离工艺流程中的铑。方法简便快速,适用较宽浓度范围的铑。可检测 2×10~(-6)M Rh。
Anodic voltammetric determination of rhodium was studied. Rh (Ⅲ) yellow Rh (OH) _6 ~ 3-ions generated in alkali metal hydroxide solution produced good oxidation wave on the rotating platinum electrode in the potential range of 0 ~ + 0.5V (vs. SCE). The half-wave potential is about +0.32 volts. Logarithm analysis of the voltammetric curve, potentiostatic electrolysis, and Rh (III) titration with a standard cerium (IV) solution showed that the oxidation of Rb (IV) on the platinum electrode was in accordance with diffusion control The reversible wave. The addition of sodium citrate increases the allowable amount of iridium. This method was used to determine a number of rhodium, iridium separation process rhodium. The method is simple and fast, suitable for a wide range of concentrations of rhodium. Can detect 2 × 10 ~ (-6) M Rh.