报道了以铱(IV)催化溴酸钾氧化三氯偶氮氯膦的褪色反应,建立了一种在水相中直接测定微量铱的催化光度分析法.铱含量在10.0～100.0μg·L-1范围内符合比耳定律,检出限10.0μg·L-1.用于合成样中铱的测定,回收率在98.0%～101.7%之间. A catalytic spectrophotometric method for the direct determination of trace iridium in aqueous media with iridium (IV) as a catalyst for the oxidation of trichloro-chlorophosphonates by potassium bromate was developed. The iridium content was in the range of 10.0-100.0 μg · L -1 Beer’s law was obeyed, the detection limit was 10.0μg · L-1, which was used for the determination of iridium in the synthetic samples with recoveries between 98.0% and 101.7%.