液相微萃取-离子色谱法测定污水中痕量芳香胺

基于中空纤维液相微萃取技术，建立了河流污水中两种芳香胺类物质（邻甲苯胺和对氯苯胺）的离子色谱分析方法。采用中空纤维液相微萃取和离子色谱联用技术，对中空纤维萃取条件进行优化。优化的萃取条件：萃取溶剂为正辛醇，供体相中NaOH的浓度为0.01mol/L, NaCl的浓度为500g/L,接受相中HCl的浓度为0.1 mol/L，搅拌速度为430r/min，萃取时间为30min，在优化条件下，邻甲苯胺的富集倍数为88倍，对氯苯胺的富集倍数为124倍。供体相中邻甲苯胺和对氯苯胺的浓度在0.005–0.1mg/L范围内成良好线性，相关系数为0.9998-0.9999 ，检出限为0.2-0.5μg /L，相对标准偏差为0.85-3.38 %。结论：这种方法操作简单，环境友好，提高了离子色谱检测芳香胺类物质的灵敏度。

Determination of trace aromatic amines in waste water using microextraction combined with ion chromatography

The aim of this work is to develop a simple, selective, sensitive and inexpensive analytical method for the simultaneous determination of several aromatic amines. In this work, a new method for the determination of trace aromatic amines, including o-toluidine and 4-chloroaniline in waste water was developed by hollow fiber membrane extraction with ion chromatography. The optimal extraction conditions were as follows: by using 1-octanol as the organic phase with 500 g/L NaCl and 0.01 mol/L NaOH as the donor phase, and 0.1 mol/L HCl as the acceptor phase, the extraction was performed at a stirring rate of 430 r/min for 30 min. The linear range of both of o-toluidine and 4-chloroaniline was 0.005 - 0.1 mg/L, with correlation coefficients larger than 0. 999. The detection limits of o-toluidine and 4-chloroaniline were 0.2 microg/L and 0.5 microg/L with the relative standard deviations (RSDs) of 0.85% and 3.38%, respectively. The method has been applied to the simultaneous determination of trace aromatic amines including o-toluidine and 4-chloroaniline in the waste water.