:报道一个催化光度测定锇的简便方法。在 0 0 10mol/L硫酸和 90℃热水浴中 ,Os 催化高碘酸盐氧化丁基罗丹明B(BRB) ,用固定时间法在 5 5 5nm波长处测量BRB的吸光度降低 ,线性范围为 0～ 6 8ng/mL,检出限为 0 0 2 4ng/mL ,对 4 0ng/mLOs 测定的相对标准偏差为 1 32 % (n =11) ,导出了动力学方程 ,探讨了反应机理 ,催化反应的表观活化能为 2 14 6kJ/mol,本法已用于实际样品分析 ,结果满意 : A simple method for the catalytic spectrophotometric determination of osmium is reported. Os was used to catalyze the periodate oxidation of butyl rhodamine B (BRB) in 0 0 10mol / L sulfuric acid and 90 ℃ hot water bath. The absorbance of BRB was measured by fixed time method at a wavelength of 555nm. The linear range was The detection limit was 0 0 2 4 ng / mL and the relative standard deviation (RSD) was 104% (n = 11). The kinetic equation was deduced and the reaction mechanism, catalytic The apparent activation energy of the reaction is 2 14 6 kJ / mol. This method has been applied to the actual sample analysis with satisfactory results