Ir-KIO_4-甲基紫体系催化光度法测定痕量铱

Catalytic Spectrophotometric Determination of Iridium Using Ir-KIO 4-Methyl Violet

在０．２ｍｏｌ／Ｌ ＨＣｌ 介质中， 微量Ｉｒ 的存在对ＫＩＯ４ － 甲基紫的褪色反应有明显的催化作用， 反应在沸水中加热５ｍｉｎ 即完成。建立了微量铱的催化分光光度分析方法， 其检出限为６．２４ ×１０ － ９ｇ／ｍｌ， 铱含量在０ ～６０ ｎｇ／ｍｌ， 符合比尔定律。用于实际样品分析结果满意。

A new catalytic spectrophotometric method for the determination of trace iridium has been established based on the catalytic action of Ir on the oxidative fading of KIO 4 methyl violet in 0 2 mol/L HCl and water bath.The detection limit is 6 24×10 -9 g/ml.It obeys the Beer's law when Ir content is in the range of 0～60ng/ml.The method has been applied to determine samples with satisfactory results and has the advantages of simplicity, rapidity and sensitivity.