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文献研究了金属钚中钍的催化极谱测定,线性范围为8.5×10~(-6)～3.4×10~(-4)mol·1~(-1)。文献研究了钍在硝酸锂介质中的极谱行为,可检出3.4×10~(-6)mol·1~(-1)的钍。这些方法灵敏度不及常用的光度法。姚修仁等研究了钍在氯化铵-铜铁试剂-二苯胍介质中的极谱行为,该体系中钍有较高的灵敏度,钍在5×10~(-4)～3×10~(-2)μg·ml~(-1)间呈线性关系,但测量条件十分严格,手续繁琐。本文研究了在pH2左右的抗坏血酸-硝酸铵-酒石酸-铜铁试剂体系中,钍能产生一个灵敏的催化波,峰电位在—0.4V左右,检出限为2.6×10~(-7)mol·1~(-1)。探讨了催化电流的性质、影响因素和干扰元素的允许量。试样经过适当分离和富集后,可测定矿石、土壤中10~(-7)～10~(-4)的钍,结果较为满意。
The literature has investigated the catalytic polarography of thorium in metallic plutonium with a linear range of 8.5 × 10 -6 -6.4 × 10 -4 mol -1 -1. The literature investigated the polarographic behavior of thorium in lithium nitrate media and found 3.4 × 10 -6 mol -1 -1 thorium. These methods are less sensitive than the usual spectrophotometry. Yao Xiu-ren et al. Studied the polarographic behavior of thorium in ammonium chloride-copper-iron reagent-diphenylguanidine media. The thorium has a high sensitivity in this system with thorium in the range of 5 × 10 -4 to 3 × 10 ~ -2) μg · ml ~ (-1), but the measurement conditions are very strict, the procedure is cumbersome. In this paper, thorium was able to produce a sensitive catalytic wave in the ascorbic acid-ammonium nitrate-tartaric acid-copper-iron reagent system at pH2 with a peak potential of -0.4V and a detection limit of 2.6 × 10 ~ (-7) mol · 1 ~ (-1). The properties of catalytic current, influencing factors and the allowable amount of interfering elements were discussed. After the sample is properly separated and enriched, the thorium of 10 ~ (-7) ~ 10 ~ (-4) in ore and soil can be measured. The result is satisfactory.