钌催化高碘酸盐氧化亚甲蓝的反应特性及应用

报道在９０±０．５℃和硫酸介质中，Ｒｕ（Ⅲ）催化高碘酸盐氧化亚甲蓝（ＭＢ）的反应，实现了钉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１．２－５．６μｇ／Ｌ，检出限为０．００５μｇ／Ｌ。共存离子浓度高于Ｒｕ（Ⅲ）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钉的测定，其ＲＳＤ为１．３％－２．２％，标准加入回收率为 ９９％－１０５％。

Catalysis of Ruthenium in the Oxidation Reaction of Methylene Blue with Periodate and Its Analytical Application

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%.