光谱修正技术应用于废水中痕量镍测定

Spectral Correction Technique for Determination of Nickel in Wastewater with 5－Br－PADAT as Ligand

在 SDS存在下， pH6.9磷酸盐缓冲溶液中，镍与 5－ (5－溴－ 2－吡啶偶氮 )－ 2， 4－二甲基苯 (5－ Br－ PADAT)反应生成黄色显色液。本文在此显色反应基础上，根据β修正光度理论研究了测定镍的新方法。该方法能准确扣除反应体系中剩余 5－ Br－ PADAT的吸光干扰。使β修正吸光度与镍浓度 (x)呈现良好线性关系，且分析灵敏度高，实验测得样品分析相对标准偏差 RSD 1.3％，加标回收率 96.0％－ 108％。镍最低检测浓度为 0.006μ g/ml。该方法适于环境水体中痕量镍的测定。

Nickel(II) can react with 5－ Br－ PADAT at pH 6.9 to change into the yellow solution.In this paper,the determination of trace nickel has been completed by the novelβ－ correction spectrophotometry.This method is completely eliminate the effect of the excess 5－ Br－ PADAT from its coloured solution to improve the linearity of the absorbance with Ni(II) concentration(X).The results showed that the recovery of nickel was beween 96.0％－ 108％ with the RSD of less than 3.4％ .