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在合适的酸度和试剂下,Au~(8+)与电负性配位体R~-(I~-、Br~-、SCN~-)形成络阴离子(AuR_4~-),然后与碱性染料BH~+(MB~+、MV~+、RB~+)生成离子缔合三元络合物(离子缔合物AuR_4~-·BH~+),用浮选剂甲苯从水相中浮选分离富集微量金的离子缔合物于水相—有机相两相界面呈第三相沉淀。浮选物[RH~+·AuR_4~-]溶于DMF,直接雾化此溶液,以空气—乙炔焰原子吸收法测定。研究了AuI_4·MV、AuI_4·MB、AuBr_4·RB和AuSCN_4·RB四个浮选体系的浮选工作条件和行为。试验表明,本法富集倍数大,灵敏度高,选择性好,适用于测定矿石和海水中微量金,简便快速,结果满意。
Under suitable acidity and reagent, Au ~ (8+) forms complex anion (AuR_4 ~) with electronegative ligand R ~ - (I ~ -, Br ~ -, SCN ~ Dye BH ~ + (MB ~ +, MV ~ +, RB ~ +) generated ion-association ternary complex (ion complex AuR_4 ~ - BH ~ +) The ion-association complex enriched in trace gold was precipitated in the third phase at the interface of aqueous phase and organic phase. The flotation reagent [RH ~ + · AuR_4 ~ -] was dissolved in DMF, and the solution was directly atomized, determined by air-acetylene flame atomic absorption spectrometry. The flotation working conditions and behaviors of four flotation systems AuI_4 · MV, AuI_4 · MB, AuBr_4 · RB and AuSCN_4 · RB were studied. Experiments show that this method is rich in multiple, high sensitivity, good selectivity, suitable for the determination of trace gold in ores and seawater, simple and fast, with satisfactory results.