[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.