【摘要】 首次报道了在氨水介质中，微量锇（Ⅳ）对过氧化氢氧化橙黄Ⅳ褪色具有显著催化作用，并以此反应为指示反应建立了测定微量锇的催化动力学光度法。在沸水浴中加热8 min,在450 nm波长处采用固定时间法测定吸光度A，锇浓度在0.022～14 ng/mL范围内服从比尔定律，检测限为3.08×10^－11 g/mL，该法应用于贵金属样品中微量锇的测定，结果令人满意。更多还原

【Abstract】 A spectrophotometric method has been reported for the determination of mirco amounts of Os(Ⅳ),based on the catalytic action Os(Ⅳ) on the oxidation fading between orange Ⅳand H2O2 in the presence of NH3·H2O. In a boiling water bath, the solution was heated for 8 min. Beer’s Law is obeyed in the range from 0.022－14 ng/ml for Os(Ⅳ) and the detection limit is 3.08×10－11ng/ml at 450 nm. The method has been applied to the determination of Os(Ⅳ) in sample of noble metal, and the results obtained are satisfactory.更多还原