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在钌催化高碘酸盐氧化乙基罗丹明B(ERB)基础上提出了测定钌的动力学方法。测定钌的校正曲线范围为 0 2～ 1 5ng/2 5mL ,检出限低至 1 0 - 1 0 mol/LRu ,对 5,1 0 ,1 5ng/2 5mLRu 测定的相对标准偏差分别为6 60 ,3 2 0和 1 76% (n =1 1 )。反应对ERB ,Ru ,KIO4,H3PO4均为一级 ,在CIO4- CRu 条件下 ,观察到Michaelis类型的动力学 ,催化剂与高碘酸盐形成 1∶1络合物 ,表观活化能为 37 68kJ/mol。本法用于某些岩矿和冶金产品中钌的分析 ,RSD(n =8)为 1 92 %～ 2 56% ,标准加入回收率为 97 0 %～ 1 0 0 8%。
Based on the ruthenium-catalyzed periodate oxidation of ethyl rhodamine B (ERB), a kinetic method for the determination of ruthenium was proposed. The calibration curves for the determination of ruthenium range from 0 2 to 1 5 ng / 2 5 mL and the detection limits are as low as 10 0 to 10 mol / L LR. The relative standard deviations for the determination of 5,1 0,1 5 ng / 2 5 mL Ru are 6 60 , 3 2 0 and 1 76% (n = 1 1). The reaction was of the order of ERB, Ru, KIO4 and H3PO4. The Michaelis-type kinetics was observed under CIO4-CRu conditions. The catalyst formed a 1: 1 complex with periodate with an apparent activation energy of 37 68 kJ / mol. This method is used for the analysis of ruthenium in some rock and mine products and metallurgical products. The RSD (n = 8) is from 92% to 256%, and the standard addition recovery is from 97% to 1080%.