表面活性剂对钪－铜铁试剂络合吸附波的增敏效应

Enhancement of surfactants on the Complex Adsorptive Wave of Scandium-Cupferron

探讨了各种类型的表面活性剂对Ｓｃ－铜铁试剂体系的增敏效应；观察到在ｐＨ９．０的ＮＨ＿４ＯＨ－ＮＨ＿４Ｃｌ缓冲介质中，溴化十四烷基三甲铵使该体系催化波灵敏度提高了２５倍。峰电位在－１．５０Ｖ（ｕｓ．Ａｇ／ＡｇＣｌ），峰高与Ｓｃ浓度在２～４０ｎｇ／ｍｌ呈线性关系，检出限１ｎｇ／ｍｌ；用拟定的方法测定了岩石样品中的痕量Ｓｃ；并对其极谱性质和表面活性剂增敏机理进行了探讨。

ifferent types of surfactants were investigated in detail.It was shown that TTMAB leadedto a 25-fold improvement in sensitivity in a NH_4OH-NH_4Cl buffer(pH 9.0). The peak potentialwas at -1.50 V(vs.Ag/AgCl)and a linear relationship was found between the peak height andthe Sc concentration over the range 0. 002～0. 040 μg/ml. The proposed method has been usedin the determination of trace Sc in rock samples. An investigation was made on the polarographicbehavior and a discussion was given of the mechanism of the enhancement of the surfactant.