【摘要】 目的:建立测定痕量铬(Ⅵ)的双波长双指示剂催化动力学光度分析的新方法。方法:在稀硫酸介质中,利用痕量铬(Ⅵ)催化溴酸钾氧化甲基橙和结晶紫褪色的指示反应,通过测量510 nm和600 nm下,催化体系和非催化体系吸光度的变化,用双波长双指示剂催化动力学光度测定痕量铬。结果:测定铬的线性范围为0.0010~0.20μg/m l,检出限为1.1×10-10g/m l。结论:该法简单、灵敏度高、选择性好,可用于废水中痕量铬(Ⅵ)的测定。更多还原

【Abstract】 Objective:To establish a new dual-wavelength and dual-indicator catalytic kinetic spectrophotometric method for the determination of trace amounts of chromium（Ⅵ）.Methods:Chromium（Ⅵ） was determined by dual-wavelength and dual-indicator catalytic kinetic spectrophotometric method which was based on the chromium（Ⅵ） catalyzed oxidation of crystallize violet and methyl orange by potassium bromate in the media of H₂SO₄.The absorbance of the catalytic and uncatalytic systems were measured at 510 nm and 600 nm.Results:The linear range of determination was 0.0010⁰.20 μg/ml.The detection limit was 1.1×10^-10 g/ml.Conclusion:The method is simple and of high sensitivity and good selectivity.更多还原