高等学校化学学报

高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (10): 1132.

• 研究简报 • 上一篇    下一篇

贵金属元素电化学分析研究(Ⅻ)——离子交换富集分离阳极溶出伏安法测定微量铱

张玉祥, 卢繁, 苏致兴, 张永友, 徐克莉   

  1. 兰州大学
  • 收稿日期:1989-04-06 出版日期:1990-10-24 发布日期:1990-10-24
  • 通讯作者: 张玉祥, 邮编: 730000
  • 基金资助:

    国家自然科学基金

Studies on Electrochemical Analysis of Precious Metal Elements(Ⅻ) —— Determination of Micro-lridium by ASV After Enrichment and Separation with Ion Exchange

Zhang Yuxiang, Lu Fan, Su Zhixing, Zhang Youngyou, Xu Keli   

  1. Lanzhou University, Lanzhou
  • Received:1989-04-06 Online:1990-10-24 Published:1990-10-24

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摘要： 单独铱与其它贵金属和贱金属的有效分离方法仍属少见[1,2],作者[3]采用15%三烷基氧化膦-苯溶液分离过大量铱,可达理想的效果。

关键词: 贵金属元素, 铱, 阳极溶出伏安法

Abstract: In this work, the determination of micro-iridium by using anodic stripping voltammetry (ASV) after enrichment and separation with the synthetic ion exchange resin of thiopropionamide is studied. When pH=2, the resin can absorb 100% of Au(Ⅲ), Pd(Ⅱ), Pt(Ⅳ) and Ir(Ⅳ)ions from the hydrochloric acid solution. Then, when 20 mLof 6 mol/L HCl is used as an eluant, only iridium can be eluted quantitatively. Thus, the problem of.enrichment and separation of Ir from other interferring elements can be resolved. The authors investigated the conditions of determination of mi-cro-iridium by ASV without use of thin film mercury. 0. 3 mol/L HCl-0. 75μg Te4+/mL was selected as the supporting electrolytic system. The results show that the peak potential of Te(Ⅳ) is at +0. 45 V(vs SCE), whereas Ir(Ⅳ ) is at +0. 75 V, and the content of Ir(Ⅳ) is linear with peak current in the range of 10-6～10-8 g/mL. The detection limit reaches 20 × 10-3 ppm.This method has been used for analysing some sample with good results agree with that of the original content. The recovery is in the range of 96%～104%.

Key words: Precious metal element, Iridium, Anodic stripping voltammetry

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