摘要
研究了一种测定降水中微量过氧化氢的方法。在0.4~1.5mol/L磷酸介质中,过氧化氢与钒(V)及2-(3,5-二溴-2-吡啶偶氮)-5-二乙氨基苯酚(3,5-diBr-PADAP)反应形成一种组成比为1:1:1的蓝色三元配合物,其最大吸收波长为598nm,表现摩尔吸光系数为5.6×104L·mol-1·cm-1。过氧化氮量在2×10-7~1.3×10-5mol/L时服从比耳定律。方法简便,选择性较高,用于降水中微量过氧化氢的直接测定,结果令人满意。
A spectrophotometric method for the determination of trace amount of hydrogen peroxide inrain water has been studied. In the medium of 0. 4~ 1. 5 mol/L phosphoric acid, hydrogen perox-ide reacts with vanadium (V) and 2- (3, 5-dibrome-2-pyridylazo) -5-diethylaminophenol (3, 5-diBr-PADAP) to form a 1: 1: 1 blue ternary complex. lts maximum absorption is at 598 nm, andthe apparent molar absorptivity is 56000 L mol-1- cm -1. Beer's law is obeyed over the range of 2×10-7~1. 3 × 10-5 mol/L for hydrogen peroxide. The method is simple and good selective, andhas been applied to the direct determination of hydrogen peroxide in rain water with satisfactoryresul ts.
出处
《环境污染与防治》
CAS
CSSCI
CSCD
北大核心
1997年第3期40-41,共2页
Environmental Pollution & Control
关键词
酸雨
过氧化氢
分光光度法
降水
Hydrogen peroxide Vanadium 3, 5-diBr-PADAP Spectrophotometric method