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 mu g/L and 0. 5 mu/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.