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在0.075mol/L磺基水杨酸钠和pH7.9的三乙醇胺(2.2%)-盐酸缓冲溶液中,轻稀土和钇、茜紫红S形成的异多核配合物在单扫描极谱上,于-0.79V(vs.SCE)处产生一个灵敏的阴极导数峰,峰高与轻稀土浓度在2×10~(-8)～7×10~(-7)mol/L范围内呈线性关系.探讨了极谱波的性质和电极反应机理.在单扫描极谱上用单纯形法和连续变化法测定了该体系的吸附型体的组成比为La∶y∶ARS=1∶2∶7.用此法测定了土壤中轻稀土的含量。
In 0.075mol / L sodium sulfosalicylate and triethanolamine (2.2%) - hydrochloric acid buffer solution of pH7.9, the heteronuclear complexes formed by light rare earths and yttrium and purple purplish red S were observed on single scanning polarographic At -0.79V (vs.SCE), a sensitive cathodic derivative peak was obtained. The peak height was linear with the concentration of light rare earth in the range of 2 × 10 -8 -7 × 10 -7 mol / L. The properties of polarographic wave and the mechanism of electrode reaction were discussed.It was determined by simplex method and continuous change method that the composition ratio of the adsorbed body was La: y: ARS = 1: 2: 7. This method was used to determine the content of light rare earth in soil.