在pH为5.0～7.0的缓冲溶液中,Co(Ⅱ)和Ni(Ⅱ)均与亚硝基R盐形成稳定的配合物,在吐温80-硫酸钠液-固萃取体系中,都能被吐温80固相萃取.加入HCl提高溶液的酸度,Co(Ⅱ)进入吐温80固相被萃取,而Ni(Ⅱ)留在水相不被萃取,从而实现两者的分离.通过摩尔比法和连续变化法测定了吐温80固相中,Co(Ⅱ)与亚硝基R盐形成1∶3的配合物. In pH 5.0-7.0 buffer solution, Co (Ⅱ) and Ni (Ⅱ) both form stable complexes with nitroso R salt, which can be used in the liquid-solid extraction system of Tween 80-sodium sulfate Tween 80 solid phase extraction.HCl was added to increase the acidity of the solution, Co (Ⅱ) into the Tween 80 solid phase was extracted, and Ni (Ⅱ) remain in the aqueous phase is not extracted, so as to achieve the separation of the two.With the molar ratio The complex of Co (Ⅱ) with nitroso R salt formed 1: 3 in the solid phase of Tween 80 was determined by the method of law and continuous change.