在pH 2的水溶液中,钯(Ⅱ)与溴化钾和四丁基溴化铵(TBAB)形成不溶于水的三元离子缔合物,此三元配合物浮于盐水相上层形成界面清晰的液-固两相,当溶液中溴化钾和四丁基溴化铵的浓度分别为1.5×10-2,2.0×10-3mol·L-1,酸度为pH 2.0时,钯(Ⅱ)被定量浮选.汞(Ⅱ)、铅(Ⅱ)、钨(Ⅵ)和钒(Ⅴ)离子在该体系中不被浮选,实现了钯(Ⅱ)与这些离子的定量分离.对合成水样中100 μg钯(Ⅱ)进行了定量浮选分离和测定,结果表明此方法的浮选率达99.7%.

In a slightly acidic solution buffered at pH 2,an ionic association complex was formed by the reaction of Pd(Ⅱ) with potassium bromide and tetrabutyl ammonium bromide (abbreviated as PdBr2-4·2TBAB+),which is water-insoluble and floated on the surface of the aqueous phase frominga clear interface between the liquid and solid phases.Concentrations of KBr and TBAB necessary for the floatation reaction were chosen at 1.5×10-2mol·L-1 and 2.0×10-3mol·L-1 respectively.Foreign ions,i.e.,Hg(Ⅱ),Pb(Ⅱ),W(Ⅵ) and V(Ⅴ) coexisted,did not form similar complexes and hence,did not floated with Pd(Ⅱ).Floatation separation of Pd(Ⅱ) from Hg(Ⅱ),Pb(Ⅱ),W(Ⅵ) and V(Ⅴ) was attained quantitatively by this method,and the rate of floation of 99.7% was obtained when 100 μg of Pd(Ⅱ) were separated from binary mixed solutions containing the co-existing ions of Hg(Ⅱ),Pb(Ⅱ),W(Ⅵ) and V(Ⅴ).