在硫酸介质中,高碘酸钾氧化吉氏色素变色,而钌(Ⅲ)可催化高碘酸钾氧化吉氏色素褪色,由此建立了测定痕量钌的催化光度法.钌在0.002～0.008μg/mL,范围内与催化反应速率有良好的线性关系,检出限为1.88×10~(-10)g/mL.该催化反应对钌(Ⅲ)是一级反应,其表观活化能为12.44 kJ/mol.试验了40多种共存离子的影响,大多数的常见离子不干扰.方法用于贵金属精矿中钌的测定,测定值与推荐值一致,相对标准偏差(RSD)为2.2%～2.6%,加标平均回收率为98%～99%(n=6).
Potassium periodate could oxidize Giemsa solution in sulphuric acid medium (resulted in fading) and ruthenium (Ⅲ) could catalyze this reaction. Based on these, a determination of trace ruthenium by catalytic kinetic spectrophotometry was established. Ruthenium showed good linearity with catalytic reaction rate in the range of 0.002-0.008μg/mL, and the detection limit was 1. 88 ×10~(-10) g/mL. This catalytic reaction was first-order reaction for ruthenium (Ⅲ) with apparent activation energy of 12. 44 kJ/mol. The effect of more than 40 kinds of co-existing ions was investigated. It was found that most common ions had no interference. This method was applied to the determination of ruthenium in precious metal concentrate, and the results were in good agreement with the recommended value. The relative standard deviation (RSD) was 2.2%-2.6%. The average recovery of standard addition was 98%-99%(n=6).
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