摘要
研究了催化动力学分光光度法测定痕量铬。在硫酸溶液中，研究了痕量铬（Ⅵ）对溴酸钾氧化橙黄Ⅳ退色反应的催化效应及其动力学条件，建立了测定痕量铬（Ⅵ）的新方法。结果表明，最佳条件为：50mmol/L硫酸溶液用量为3．0mL,0．01％橙黄Ⅳ溶液用量为3．0mL，5mmol/L溴酸钾溶液用量为1．5mL，在50℃水浴下反应6min,加入抗坏血酸溶液终止反应，并进行了干扰分析，方法的线性范围为0．2～1．0μg／L，检出限为1.09×10^-6μg／L。该法用于水中痕量铬（VI）的测定，结果满意。
A new catalytic kinetic spectrophotometric method for the determination of traces of chromium was studied. It was based on the fact that oxidation of orange Ⅳ by potassium bromate was catalyzed by chromium in sulfuric acid, a new catalytic kinetic spectrophotometric analysis method for the determination of traces of chromium has been planted. The optimum experimental conditions are determined, the amount of sulfuric acid （50 mmol/L） is 3.0 mL, the amount of potassium bromate （5 mmol/L） is 1.5 mL, the amount of orange Ⅳ （0.01% ） is 3.0 mL, the reaction time is 6 rain at 50 ℃, at last, Vc is added to stop reaction, and analysis interference test is made. The linear range is 0.2 ～ 1.0 μg/L and the detection limit is 1.09 × 10^-6μg/L. The procedure has been used to determine the content chromium in water with satisfactory results.
出处
《应用化工》
CAS
CSCD
2007年第6期609-611,621,共4页
Applied Chemical Industry
基金
陕西省教育厅项目资助(02JK096)
关键词
铬(Ⅵ)
橙黄Ⅳ
催化反应
动力学光度法
chromium
orange Ⅳ
catalytic reaction
kinetic spectrophotometry
