Abstract: Liquid-phase microextraction with porous hollow ?bers is a novel pretreatment technology which integretes sampling,extration and concentration into one step. In the past few years, with the development of ion chromatography, it is possible to determine aromatic amines with cation exchange column. In this work, a new method for the determination of trace aromatic amines, incuding o-toluidine and 4-chloroaniline in waste water was developed by hollow fiber membrane extraction with ion chromatography. Chromatographic conditions were optimized. The optimal extraction conditions were as follows: 1-octanol as organic phase with 500g/L NaCl and 0.01 mmol/L NaOH as donor phase, while 0.1 mmol/L HCl as receiving phase, at stirring rate of 430 r/min for 30 min. The linear ranges of o-toluidine and 4-chloroaniline was 0.005–0.1mg/L, with correlation coeffcients larger than 0.999. Detection limits of o-toluidine and 4-chloroaniline were 0.2 μg /L and 0.5 μg /L with RSD at 0.85 % and 3.38 % , respectively. The method has been applied to analyze trace aromatic amines, incuding o-toluidine and 4-chloroaniline in simulated waste water.

Key words: aromatic amines, hollow fiber membrane, ion chromatography, liquid phase microextraction