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许多作者研究了用溶剂萃取分离的方法从稀土富集物中分离钍。本试验证明,以5%磷酸三丁脂——二甲苯溶液作萃取剂,从2M硫氰酸铵体系中,能有效地从含大量稀土元素的溶液中萃取分离钍。光度法测定痕量钍,必须采用灵敏度高的显色剂。近年来变色酸的单芳基偶氮和二芳基偶氮衍生物广泛地应用于分光光度法测定钍。其中,偶氮砷Ⅲ灵敏度虽然最高,但在测定含量1×10~(-4)%的钍,仍然不够。有些作者报导了在氯代二苯胍存在下,高级醇萃取偶氮砷
Many authors have studied the separation of thorium from rare earth enrichment by solvent extraction and separation. This experiment proved that 5% tributyl phosphate - xylene solution as extractant, from 2M ammonium thiocyanate system, can effectively extract thorium from the solution containing a large amount of rare earth elements. Spectrophotometric determination of trace amounts of thorium, you must use a high sensitivity of the developer. In recent years, monoaryl azo and diarylazo derivatives of chromogenic acid are widely used in the spectrophotometric determination of thorium. Among them, arsenic arsenic Ⅲ sensitivity highest, but the determination of content of 1 × 10 ~ (-4)% thorium is still not enough. Some authors report the higher alcohol extraction of azo-arsenic in the presence of chlorinated diphenylguanidine