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研究了氯化十六烷基吡啶和硫氰酸铵分离Au(Ⅲ)的行为及Au(Ⅲ)与一些金属离子分离的条件。结果表明,在水溶液中,Au(Ⅲ)与氯化十六烷基吡啶和硫氰酸铵形成不溶于水的三元缔合物Au(SCN)4-.CPC+,此三元缔合物沉淀浮于水相上层形成界面清晰的液-固两相。当溶液中氯化十六烷基吡啶和硫氰酸铵的浓度分别为7.0×10-4mol/L和5.0×10-3mol/L时,Au(Ⅲ)可与Mn(Ⅱ),Ni(Ⅱ),Co(Ⅱ),Fe(Ⅱ),Mg(Ⅱ),Al(Ⅱ)和Cd(Ⅱ)进行分离,对合成水样中的Au(Ⅲ)进行了分离和测定,Au(Ⅲ)的浮选率达到98.6%以上,其他金属离子的浮选率都在4.5%以下。该方法具有简便、快速和不污染环境等特点,在微量金的分离和富集分析中有一定的实用价值。
The separation of Au (Ⅲ) from cetyl pyridinium chloride and ammonium thiocyanate and the separation of Au (Ⅲ) from some metal ions were studied. The results show that Au (Ⅲ) forms a water-insoluble ternary association Au (SCN) 4-.CPC + with cetylpyridinium chloride and ammonium thiocyanate in aqueous solution, Floating in the upper water phase to form a clear liquid-solid two-phase interface. When the concentrations of cetyl pyridinium chloride and ammonium thiocyanate in the solution are 7.0 × 10-4 mol / L and 5.0 × 10-3 mol / L respectively, Au (Ⅲ) can react with Mn (Ⅱ), Ni The separation and determination of Au (Ⅲ) in synthetic water samples were carried out with the separation of Co (Ⅱ), Fe (Ⅱ), Mg (Ⅱ), Al (Ⅱ) and Cd (Ⅱ) Flotation rate of 98.6% or more, the other metal ions flotation rate of 4.5% or less. The method is simple, rapid and does not pollute the environment and other characteristics, in the separation and enrichment of trace gold analysis has some practical value.