研究了硫酸铵存在下硫氰酸铵-罗丹明B-H2O的液-固体系浮选分离铜(Ⅱ)的行为及其与常见离子分离的条件.结果表明,当(NH4)2SO4用量为1.0 g,0.1 mol·L-1硫氰酸铵溶液1.5 mL和0.001 mol·L-1罗丹明B溶液2.0 mL时,铜(Ⅱ)以不溶于水的三元离子缔合物(RhB)2[Cu(SCN)4]形式在液-固两相界面定量浮选析出,而Cd2+、Mn2+、Co2+、Ni2+、Al3+等离子在此条件下不被浮选,实现了铜(Ⅱ)与这些离子的定量分离,对合成水样中微量铜(Ⅱ)进行的定量浮选分离测定,浮选富集的平均回收率达101.4%.

The characteristics of separation of Cu(Ⅱ) ion by floatation in an aquo-solid system of NH4SCN-rhodamine B-H2O in the presence of solid (NH4)2SO4 and the conditions of separation of Cu(Ⅱ) from some other commonly encountered metal ions,e.g.Cd2+,Mn2+,Co2+,Ni2+,Al3+ and etc.were studied.The optimized amounts of reagents required in the floatation process were given as follows:① solid (NH4)2SO4:1.0 g;② 0.01 mol·L-1 NH4SCN solution:1.5 mL;③ 1×10-3mol·L-1 rhodamine B solution:2.0 mL and ④ total volume of the analyte before adding (NH4)2SO4:10.0 mL.Under the condition specified above,Cu(Ⅱ) in the solution was precipitated as the water insoluble ternary ionic association complex,(RhB)2[Cu(SCN)4],and floated at the interface of aqua-solid phases,while those coexisting metal ions mentioned above remained in aqua phase.In its application to the determination of microamounts of copper in simulated water sample,the recoveries of copper by floatation enrichment achieved to an average of 101.4%.