钌(Ⅲ)催化溴酸钾氧化酸性铬蓝K动力学光度法测定痕量钌(Ⅲ)(英文)

Kinetic spectrophotometric determination of trace ruthenium(Ⅲ) based on catalytic effect of ruthenium(Ⅲ) on oxidation of acid chrome blue K by potassium bromate

在100℃，0．16mol／LH3PO4介质中，痕量钌（Ⅲ）催化KBrO3氧化酸性铬蓝K（ACBK）发生褪色反应，于524nm处测定吸光度降低值以监控ACBK的催化反应过程，基于此原理建立了测定痕量钌（Ⅲ）的动力学光度法。该方法对钌（Ⅲ）的检出限为5．03×10^-3νg／L，校准曲线的线性范围为0～0．80vg／L，低于10倍钌（Ⅲ）浓度的共存离子不干扰测定。方法成功应用于矿石和冶金产品中痕量钌（Ⅲ）的测定，相对标准偏差（RSD）为2．8％～4．0％，加标回收率为99．0％～103．0％。

A sensitive catalytic spectrophotometric method for the determination of ruthenium （Ⅲ） has been developed, based on catalytic effect of ruthenium （Ⅲ） on the oxidation reaction of acid chrome blue K （ACBK） with potassium bromate in 0.16 mol/L H3PO4 at 100 ℃ and measuring the decrease in the absorbance at 524 nm spectrophotometrically. The calibration curve is linear in the concentration range over 0.00--0. 80 μg/L and the detection limit of the method for Ru（Ⅲ） is 5.03 × 10^-3 μg/L. Almost foreign ions do not interfere in the determination at less than 10-fold concentration of Ru （Ⅲ）. The method is highly sensitive, more selective and very stable, and has been successfully applied for the determination of trace ruthenium in some ores and metallurgy products with the relative standard deviations （RSD） of 2.8 %--4.0 % and the recovery of 99.0 %--103.0 %.