中华医学超声杂志

应用化学 ›› 1989, Vol. 0 ›› Issue (4): 78-80.

• 研究简报 • 上一篇    下一篇

痕量Au、Bi和Cd的萃取浮选及原子吸收光谱法测定

李谦义1, 方文焕2, 吴绍祖2   

  1. 1. 福建师范大学福清分校化学系;
    2. 泉州华侨大学化学系
  • 收稿日期:1988-08-05 修回日期:1988-12-29 出版日期:1989-08-10 发布日期:1989-08-10

FLOATATION-SPECTROPHOTOMETRIC DETERMINATION OF Au,Bi AND Cd

Li Qianyi1, Fang Wenhuan2, Wu Shaozu2   

  1. 1. Department of Chemistry, Fuqin Branch College, Fujian;
    2. Department of Chemistry, Quanzhou Hua Qiao University, Quanzhou, Fujian
  • Received:1988-08-05 Revised:1988-12-29 Published:1989-08-10 Online:1989-08-10

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摘要： 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[1-5]。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。

关键词: 萃取浮选, 罗丹明B, 金, 铋, 镉, 原子吸收光谱法

Abstract: Bromide complexes of Au(Ⅲ), Bi(Ⅲ) and Cd(Ⅱ) ions form associates with rhodamine B.The associated substances can be separated by floatation and determined for Au, Bi and Cd by air-acetylene flame atomic absorption-spectrophotometry. The optimum conditions for.the determination are described. The floating recovery ratio is greater than 90%. By this method, it is possible to determine trace amount of Au, Bi and Cd in sea water, pure zinc plates 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.

Key words: Extraction-floatation, Rhodamine B, Gold, Cadmium, Bismuth, Atomic absorption spectrophotometry

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