铱催化高碘酸钾氧化吖啶红动力学光度法测定痕量铱  

Catalytic kinetic spectrophotometric determination of trace iridium based on the oxidation reaction of acridine red by potassium periodate

作　　者：郭洁[1] 杨志毅 赵霞[1] 黄毕生[1] 曹秋娥[2] 

机构地区：[1]大理学院生化系,云南大理671000 [2]云南大学化学系,云南昆明650059

出　　处：《冶金分析》2006年第3期25-27,共3页Metallurgical Analysis

基　　金：大理学院科研基金(2002X03)

摘　　要：在硫酸介质中，基于铱（Ⅳ）对高碘酸钾氧化二甲基二氨基吨基氯（吖啶红，AR）褪色反应的催化作用，建立了一个测定铱的新催化动力学光度法。研究了该指示反应的最佳反应条件和动力学参数。在优化的条件下，反应速率与铱的质量浓度在0．16～32．0μg／L范围内呈良好线性关系，检出限为1．2×10^-4μg／mL。方法已用于冶金产品和岩矿石中痕量铱的测定。Based on the catalytic effect of iridium（Ⅳ） on the oxidation reaction of dimethyldiminoxanthenyl chloride （acridine red, AR） by KIO4 in the H2SO4 medium, a new kinetic spectrophotometric method for determination of trace iridium（Ⅳ） was established. The optimum conditions and kinetic parameters were investigated. Under the selected conditions, a good linear relationship could be obtained between the catalytic reaction rate and the concentration of iridium（Ⅳ） in the range of 0.16-32.0μg/L with detection limit of 1.2×10^-4μg/mL. The method has been successfully applied for the determination of iridium in the metallurgical products and ore samples.

关 键 词：铱(Ⅳ) 吖啶红 高碘酸钾 催化动力学光度法 

分 类 号：O657.32[理学—分析化学]