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本文研究了16种表面活性剂对铽-铜铁试剂-氯化铵极谱体系的增敏作用。实验结果表明,除阳离子表面活性剂、长链烷基吡啶以及在溶液中不能形成“胶束”的表面活性剂外,其它的阳离子表面活性剂、非离子表面活性剂和两性表面活性剂均能对上述体系产生增敏作用。氯化十二烷基三甲铵(DTMAC)的增敏作用最强。利用示波导数极谱测定铽的最佳条件为:0.03MNH_4Cl-0.08％铜铁试剂(Cup)-0.005％DTMAC-O.1％NH_4OH,pH～9.铽浓度在4.4×10~(-10)M～4.4×1O~(-9)M之间与波高成线性关系。干扰元素经萃取和色谱分离后,本方法可成功地用于矿石中痕量铽的测定。
In this paper, the sensitizing effects of 16 surfactants on the terbium-copper-iron reagent-ammonium chloride polarographic system were studied. The experimental results show that, in addition to the cationic surfactant, long-chain alkyl pyridine, and in the solution can not form a “micelle” surfactant, the other cationic surfactants, nonionic surfactants and amphoteric surfactants Stimulation of the above system. Dodecyltrimethylammonium chloride (DTMAC) has the highest sensitizing effect. The best conditions for the determination of terbium by oscillopolarographic polarography are: 0.03MNH_4Cl-0.08% Cup-0.005% DTMAC-O.1% NH_4OH, pH ~ 9. The concentration of terbium is 4.4 × 10 -10 ) M ~ 4.4 × 1O ~ (-9) M and wave height into a linear relationship. After the interference element is extracted and chromatographed, the method can be successfully applied to the determination of trace terbium in ore.