【摘要】 <正> 浮选法分离痕量金属离子,由于灵敏度高、选择性强已得到广泛应用。本文利用浮选法使Au³⁺、Bi³⁺和Cd²⁺同KBr反应生成的络合阴离子与碱性染料罗丹明B（RB）生成既疏水又疏有机溶剂的三元离子缔合物,后者经甲苯浮选分出,用二甲基甲酰胺（DMF）溶解后,可用原子吸收法测定Au、Bi和Cd的含量。本方法用于海水,锌片和矿样中上述三种元素的微量测定,可提高检测灵敏度,而且K、Na、Ca、Mg等共存离子不生干扰。具体实验方法如下:更多还原

【Abstract】 Bromide complexes of Au（Ⅲ）, Bi（Ⅲ） and Cd（Ⅱ） ions form associates with rhodamineB.The associated substances can be separated by floatation and determined for Au, Bi andCd by air-acetylene flame atomic absorption-spectrophotometry. The optimum conditions for.the determination are described. The floating recovery ratio is greater than 90%. By thismethod, it is possible to determine trace amount of Au, Bi and Cd in sea water, pure zincplates and minerals. Co²⁺, Ni²⁺, Ca²⁺, Al⁺³,Fe³⁺, Mg²⁺, Mn²⁺, Cr³⁺,K⁺ and Zn²⁺ etc.do not interfere the determination. The detection Iimit was found to be 25ng/mL for Au,60ng/mL （for Bi） and Cd 4.5ng mL （for Cd） respectively.更多还原