催化氧化靛蓝胭脂红褪色反应动力学测定痕量铝(Ⅲ)的研究

Determination of Trace Aluminum(Ⅲ) Based on the Oxidation of Indigo Carmine by Catalytic Kinetics Spectrophotometry

在H2SO4介质中,痕量铝(Ⅲ)能灵敏地催化KBrO3氧化靛蓝胭脂红使其褪色,据此,建立了测定痕量铝(Ⅲ)的催化动力学新方法.研究了该催化褪色反应的最佳动力学条件并求得有关参数.方法的检出限为1.13ng/mL,线性范围为0.004～0.2μg/mL,将其用于水样(湖水、池塘水、自来水)中痕量铝(Ⅲ)的测定,获得了满意的结果.

It has been observed that trace aluminum can sensitively catalyze the discoloration reaction of Indigo Carmine oxidized by KBrO3 in H2SO4 medium. The kinetic optimum conditions of the catalytic reaction were investigated and a new method for the determination of trace aluminum was proposed. The linear range for determination of aluminum is 0. 004～0.2μg/mL, and the detection limit of aluminum is 1.13 ng/mL. This method has been applied to the determination of aluminum in lake, pond and tap waters with satisfactory results.