有机络合剂倾向于形成极为安定的铀络合物,它较相应的镍及钴化合物更为安定。这种方法不但可用为铀的专一测定,还可选择富聚以及将双氧铀离子(UO_2~(++))和其它金属离子分离。用乙二醛-双(2-羟基苯胺)[Glyoxal-bis(2-hydroxyanil)]得到红紫色的乙二醛-双(2-羟基苯胺)-二氧铀(Ⅵ)[Dioxo-glyoxal-bis(2-hydroxyanil)-Uran(Ⅵ)]在光度分析时有专一性,可达1γU/毫升,将乙二醛-双(2-羟基苯胺)的络合基团 Organic complexing agents tend to form extremely stable uranium complexes that are more stable than the corresponding nickel and cobalt compounds. This method can be used not only for uranium-specific determination but also for enrichment and separation of uranium (UO 2 ~ (++)) from other metal ions. Dioxo-glyoxal-bis (2-hydroxyaniline) -dioxidium (Ⅵ) was obtained by glyoxal-bis (2-hydroxyanil) (2-hydroxyanil) -Uran (VI)] is specific for photometric analysis up to 1 [gamma] U / ml. The glyoxal-bis