Ir(Ⅳ)-KIO4-偶氮氯膦-PA催化分光光度法测定痕量铱的研究

Study on Catalytic Spectrophotometric Determination of Trace Iridium by Ir(Ⅳ)-Chlorophosphonazo-PA-KIO4 System

中文关键词:  偶氮氯瞵-PA  铱  催化分光光度法

英文关键词:chlorophosphonazo-PA  iridium  calalytic spectrophotometry

中文摘要:

      在酸性介质中,高碘酸钾使显色剂偶氮氯膦 PA的褪色反应在痕量铱的催化作用下才能实现.其褪色度与铱浓度有良好的线性关系.研究了此反应的最佳条件,提出了在水相中直接测定痕量铱的催化分光光度分析法.方法检出限可达0.01μg/10mL,铱含量在0.03～0.45μg/10mL范围内符合比尔定律.此法灵敏度高,简便易行快速,选择性好.

英文摘要:

      A catalytic spectrophotometric method based on the catalytic effect of Ir(Ⅳ) on the oxidation of chlorophosphonazo-PA with KIO₄ in acidic medium has been proposed for the determination trace iridium. The optimal conditions were studied and the reaction was carried out directly in aqueous solution.The detection limit is 0.01 μg/10 mL. The Beer's law is obeyed in the range of 0.03～0.45 μg/10 mL. The method proposed has been applied to the determination of iridium in artificial sample with satisfactory results.