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在硫酸介质中 ,微量铬 ( )能显著催化溴酸钾氧化丁基罗丹明 B褪色。研究了该指示反应的动力学行为 ,建立了测定痕量铬的新的催化动力学分析方法。方法的线性测定范围为 0 .0 4～ 2 .0 μg/2 5 m L,检出限为 9.68× 1 0 - 10 g/m L。本法用于电镀废水中 Cr( )的测定 ,结果满意
In sulfuric acid medium, trace chromium () can significantly catalyze the oxidation of butyl rhodamine B with potassium bromate. The kinetic behavior of the indicated reaction was studied and a new catalytic kinetic analysis method for the determination of trace chromium was established. The linear range of the method was 0. 04-2. 0 μg / 25 m L with a detection limit of 9.68 × 10 ~ 10 g / m L. This method is used for the determination of Cr () in electroplating wastewater with satisfactory results