| The content of iridium in iridium compound was determined by ferrous sulfate current titration. In this paper, studied dissolution method, amount of reagents, coexisting elements and influencing factors of the determination process of iridium compounds and obtained the best experiment conditions. The results showed that the samples were transformed by hydrochloric acid - hydrogen peroxide in high temperature and high pressure treatment，to unify the valence state of iridium as iridium (Ⅳ), then determined by ferrous sulfate current titration. This method can avoid the distortion of detection results which caused by some iridium compounds in conventional dissolved the inconsistent iridium valence state. The determination range of the method were 10% ~ 60%; the recovery rates of standard addition were 99.75% ~100.13%. The precision was 0.10% ~ 0.25% of IrCl3, IrCl4, H2IrCl6, (NH4)2IrCl6, Ir(OAC)3, Ir(acac)3 which can meet the precision and accuracy requirements of high iridium compounds. |
