2-(2-喹啉偶氮)-4-甲基-1,3-二羟基苯分光光度法测定钒

Spectrophotometric Determination of Vanadium in Alloy with 2-(2-Quinolinylazo)-4-Methyl-1,3-Dihydroxidebenzene

在 p H为 3.5的柠檬酸 -氢氧化钠缓冲介质中 ,溴化十六烷基三甲基铵 (CTMAB)存在下 ,新试剂 2 -(2 -喹啉偶氮 ) - 4-甲基 - 1,3-二羟基苯 (QAMDHB)与钒发生显色反应 ,生成 2∶ 1稳定络合物 ,最大吸收波长为 5 5 2 nm,摩尔吸光系数 ε=8.0 5× 10 4L· mol-1· cm-1,钒含量在 0— 0 .6 μg/ m L内符合比耳定律。用于几种合金样品中钒的分析 ,结果令人满意。

In the presence of CTMAB and citric acid-sodium hydroxide buffer solution (pH 3 .5) medium,2-(2-quinolinylazo)-4-methyl-1,3-dihydroxidebenzene (QAMDHB) r eacts with vanadium(Ⅴ) and forms a stable 2∶1 color complex with molar absorpt ivity of 8.05×104L·mol -1 ·cm -1 at 552nm.Beer's law is obeyed in the range of 0—0.6μg/mL.This method was applied to the determination of vanadi um in alloy with good results.