橙黄G-高碘酸钾动力学光度法测定痕量铑

Kinetic spectrophotometric method for the determination of trace rhodiumⅢ with orange G and potassium periodate

在乙酸钠介质中 ,微量Rh 能显著催化高碘酸钾氧化橙黄G(OG)的褪色反应。研究了该指示反应的最佳反应条件和动力学参数 ,建立了一个测定痕量铑的新的催化动力学分析方法。于 2 5mL溶液中 ,方法的线性范围为 0 0 0 2 0～ 0 90 μg ,检出限为 1 6× 10 - 1 0 g/mL。本法满意地用于实际样品中铑的测定。

A new kinetic method for the determination of trace Rh*# was established based on the catalytic action of Rh Ⅲ on the oxidative fading reaction between orange G and KIO 4 in the sodium acetate medium The optimum conditions and the kinetic parameters were investigated The linear range for the determination of Rh*# by the proposed method is 0 0020-0 90μg/25mL,the detection limit is 1 6×10 -10 g/mL The method has been used for the determination of trace rhodium Ⅲ in the actual samples with satisfactory results