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报道在阳离子表面活性剂四丁基溴化铵(TBAB)存在下,铑(Ⅲ)-2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺体系的极谱催化波.在单扫示波极谱仪上,铑(Ⅲ)与5-Br-PADMA在—1.16V处能产生一灵敏的极谱催化波.加入四丁基溴化铵后,波形得到改善,灵敏度明显提高,铑(Ⅲ)浓度在9.7×10~(-10)～1.2×10~(-6)mol/L范围内与一阶导数波高成线性关系,检测限达7.8×10~(-10)mol/L.并采用多种电化学方法研究了该体系极谱波性质,结果表明属于氢催化波,此法已应用于一些样品中痕量铑(Ⅲ)的测定.
The polarographic catalytic wave of rhodium (Ⅲ) -2- (5-bromo-2-pyridylazo) -5-dimethylaminoaniline was reported in the presence of a cationic surfactant, tetrabutylammonium bromide (TBAB) In single-sweep polarography, rhodium (Ⅲ) and 5-Br-PADMA can produce a sensitive polarographic catalytic wave at -1.16V, and the addition of tetrabutylammonium bromide improves the waveform and the sensitivity The linear range of rhodium (Ⅲ) concentration was in the range of 9.7 × 10 -10 -1.2 × 10 -6 mol / L with the first derivative wave height. The detection limit was 7.8 × 10 -10 mol / L. The polarographic properties of the system were studied by a variety of electrochemical methods and the results showed that it belongs to the hydrogen catalytic wave. This method has been applied to the determination of trace rhodium (Ⅲ) in some samples.