在pH 3的缓冲溶液中,且在2.5×10-3mol·L-1氯化钠及4.0×10-4mol·L-1四丁基溴化铵(TBAB)存在下,金(Ⅲ)形成水不溶性的缔合物,AuCl-4·TBAB+在水相表面浮选析出,而在此相同条件下,铟(Ⅲ)、镓(Ⅲ)、铈(Ⅳ)、钨(Ⅵ)及钒(Ⅴ)5种离子均不形成不溶性沉淀物析出.据此可达到金(Ⅲ)与上述其他5种共存离子之间的定量分离.对200 μg金(Ⅲ)与500 μg其他5种离子混合配成的模拟水样按上述方法进行了分离以考虑此方法的分离效果,结果表明:金(Ⅲ)的浮选率达到99.8%,而其他5种离子的浮选率均在4.5%以下.

In a buffer solution of pH 3,and in the presence of 2.5×10-3mol·L-1 NaCl and 4.0×10-4mol·L-1 tetrabutylammonium bromide (TBAB),a water insoluble complex of Au(Ⅲ) in form of AuCl-4·TBAB+ was separated and floated at the surface of the aqueous phase. While ions of In(Ⅲ),Ga(Ⅲ),Ce(Ⅳ),W(Ⅵ) and V(Ⅴ) were not precipitated under the same condition,hence quantitative separation of Au(Ⅲ) from the 5 elements mentioned above was attained. Efficiency of the proposed floatation separation was tested on a simulated water sample containing 200 μg of Au(Ⅲ) and 500 μg of each of the other 5 elements,rate of floatation (E/%) of Au(Ⅲ) found was 99.8% while values of floatation rate of the 5 co-existing ions were less than 4.5%.