【摘要】 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 ,结果满意更多还原

【Abstract】 A new kinetic method for the determination of trace chromium(Ⅵ) was established based on the catalytic action of Cr(Ⅵ) on the oxidative fading reaction between butylrhodamine B and KBrO 3 in sulfuric acid mediun. The calibration graph was linear in the range of 0.040～2.0 μg/mL for Cr(Ⅵ), and the detection limit was 9.68×10 -10 g/mL. The method has been used for the determination of trace chromium in the eletroplating waste water with a satisfactory result.更多还原