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钍的极谱测定过去报导很少,近年来国外有一些报导,Srefer选择0.01N硝酸锂作支持电解质测定微克量钍。Sindhu在0.1M NaClO_4和30％甲醇的乙酸缓冲溶液中(pH为4.8),有3-羟基吡啶-2-硫醇存在下测定20—40μM钍。Sugawara则采用Bi-EDTA取代法。Donoso介绍两种支持电解质中含有铀、钍的示波极谱测定。我们发现在0.025M柠檬酸,2×10~(-4)M铜铁试剂溶液中(PH为1—2),当有少量钍存在时,在铜铁试剂波之后,有一良好的导数示波极谱波,此波随着钍量增加而加大,灵敏度较高,可检测0.1ppm钍,
Thorium polarography in the past few reports, in recent years, some foreign reports, Srefer choose 0.01N lithium nitrate as a support electrolyte determination of micrograms of thorium. Sindhu 20-40 μM thorium was determined in the presence of 3-hydroxypyridine-2-thiol in 0.1 M NaClO 4 and 30% methanol in acetic acid buffer (pH 4.8). Sugawara uses the Bi-EDTA substitution method. Donoso describes oscillopolarographic determination of two supported electrolytes containing uranium and thorium. We found that in 0.025M citric acid, 2 × 10 -4 M copper and iron reagent solution (pH 1-2), when there is a small amount of thorium, after the copper and iron reagent wave, there is a good derivative oscilloscope Polarographic wave, this wave increases with the increase of thorium, high sensitivity, can detect 0.1ppm thorium,