【摘要】 在硫酸介质中,钌(Ⅲ)对高碘酸钾氧化甲基绿褪色反应具有显著的阻抑作用,从而提出了一种阻抑动力学光度法测定痕量钌(Ⅲ)的方法。优化的试验条件如下:①0.01mol.L-1高碘酸钾溶液用量为1.40mL;②1×10-3 mol.L-1甲基绿溶液用量1.50mL;③反应温度为80℃;④反应时间为10min。钌(Ⅲ)的质量浓度在0.04～64μg.L-1范围内与ΔA呈线性关系,检出限(3s/k)为8.5ng.L-1。方法用于活性炭和分子筛中痕量钌(Ⅲ)的测定,测定值的相对标准偏差在1.6%～2.2%之间,加标回收率在98.6%～100%之间。更多还原

【Abstract】 It was found that in H2SO4 medium,the oxidation of neutral red by hydrogen peroxide was strongly inhibited by the presence of Ru(Ⅲ).Based on this fact,the determination of traces of Ru(Ⅲ) by inhibitory kinetic photometry was proposed.The optimized conditions found were as follows: ① amount of 0.01 mol·L-1 KIO4 solution: 1.40 mL;② amount of 1×10-3mol·L-1 methyl green solution: 1.50 mL;③ temperature of reaction: 80 ℃;④ time of reaction: 10 min.Linear relationship between values of ΔA and mass concentration of Ru(Ⅲ) was obtained in the range of 0.04-64 μg·L-1.Detection limit(3s/k) of the method found was 8.5 ng·L-1.The proposed method was applied to the determination of Ru(Ⅲ) in samples of active carbon and molecular sieve.Recovery was tested by addition of standard solution to samples,giving values of RSD′s(n=6) and recovery ranged from 1.6%-2.2 % and 98.6%-100% respectively.更多还原