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本文发现毫克量Ca~(2+)离子对稀土(Ⅲ)-2,2°-二溴-4-氟-偶氮氯膦(RE(Ⅲ)-DBF-CPA]二元体系络合物极谱吸附波(PAW)有明显增敏作用,同时发现在示波极谱上出现新还原峰,其吸收光谱曲线也有新吸收峰出现,表明已形成新的络合物。在此基础上建立了测定痕量RE的极谱吸附波新方法。其线性范围为5.7×10~(-9)～8.0×10~(-7)(RE)mol/L,检出下限为1.4×10~(-9)(RE)mol/L。曾用本法测定了蕃茄叶和绿茶等试样中痕量稀土。并与偶氮胂Ⅲ光度法相对照,结果满意。稀土加标回收率为97％～105％。本文还对该络合物的组成和结构、电极反应、电流性质等问题也进行了研究。
In this paper, we found that the effect of milligram Ca 2+ ion on the complex complex of rare earth (Ⅲ) -2,2 ° -dibromo-4-fluoro-chlorophosphonazo (RE (Ⅲ) Spectral adsorption wave (PAW) has a significant sensitizing effect, at the same time found in the oscillopolarographic new reduction peak, the absorption spectrum curve also has a new absorption peak appears, indicating that a new complex has been formed.On the basis of this established A new method for the determination of trace polarographic adsorbed RE was developed.The linear range was 5.7 × 10 -9 ~ 8.0 × 10 -7 RE and the detection limit was 1.4 × 10 ~ 9) (RE) mol / L. This method has been used to determine the tomato leaf and green tea and other trace elements in the sample, and with arsenazo Ⅲ photometric method, the results were satisfactory. Recoveries of rare earths 97% ~ 105 % .In this paper, the composition and structure of the complex, electrode reaction, current properties and other issues were also studied.