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本文报道了轻稀土(La、Ce、Pr、Nd)——茜素红S络合物极谱吸附波。在含有1.0×10~(-5)mol/L茜素红S.0.075 mol/L磺基水杨酸钠的三乙醇胺-盐酸缓冲溶液(pH7.9)中,在JP-2型示波极谱上可获得灵敏的轻稀土络合物单扫极谱吸附波,峰电位为—0.80V(VS.SCE)。用二次导数档可测定9.0×10~(-9)-1.0×10~(-6)Mol/L的轻稀土。本文对极谱吸附波的性质和电极反应的机理进行了探讨。在汞电极上用拟单纯形法和连续变化法测定了诱导吸附型体的组成为LaL_2(L_2)_(ads).并测定了稀土球墨铸铁中轻稀土的含量。
In this paper, polarographic adsorption waves of light rare earth (La, Ce, Pr, Nd) - alizarin red S complex have been reported. In a triethanolamine-hydrochloric acid buffer solution (pH 7.9) containing 1.0 × 10 -5 mol / L alizarin red S.0.075 mol / L sodium sulfosalicylate, Spectra can be obtained on a single light-rare-earth complex single sweep polarographic adsorption wave, the peak potential of -0.80V (VS.SCE). With the second derivative file can be measured 9.0 × 10 ~ (-9) -1.0 × 10 ~ (-6) Mol / L light rare earth. In this paper, the nature of polarographic adsorption wave and the mechanism of electrode reaction were discussed. The composition of the induced adsorbate was determined to be LaL_2 (L_2) _ (ads) on the mercury electrode using pseudo simplex method and continuous variation method. The content of light rare earth in rare earth nodular cast iron was measured.