报道在90±0.5℃和硫酸介质中，Ru*#催化高碘酸盐氧化亚甲蓝(MB)的反应，实现了钌的动力学光度法测定，研究了反应的适宜条件及动力学参数，并探讨了反应机理。方法的线性范围为0.0～1．2和1.2～5．6 μg/L，检出限为0 .005 μg/L。共存离子浓度高于Ru*#浓度50倍不干扰测定。本法灵敏度高、选择性好、稳定，已满意地用于岩矿及冶金产品中钌的测定，其RSD为1.3％～2．2％，标准加入回收率为99%～105％。“,”The catalytic effect of ruthenium on the oxidation reacti on of methylene blue (MB) was investigated and applied for the determination of ruthenium(Ⅲ) by the kinetic spectrophotometry in the sulfuric acid medium at 90±0.5℃. The optimum reaction conditions, kinetic parameters and r eaction mechan ism were studied. The linear ranges for the determination of ruthenium (Ⅲ) were 0.0～1.2 and 1.2～5.6 μg/L with a detection limit of 0.05 μg/L . Almost no foreign ions more than 50-fold concentration of Ru(Ⅲ) I nterfered with the determination. The method, which was of high sensitivity, good selectivity and stability, was s uccessfully applied for the determination of trace ruthenium in some ores and m e tallurgical products, the RSD (n=8) was 1.3%～2．2％ and the recovery was between 99% and 105%.