SELECTIVE DETERMINATION OF AROMATIC-AMINES IN WATER SAMPLES BY CAPILLARY ZONE ELECTROPHORESIS AND SOLID-PHASE EXTRACTION

The use of a 20:80 (w/w) mixture of keto-derivatized and underivatized poly(styrene-divinylbenzene) copolymer for the selective solid-phase extraction (SPE) of pollutants in environmental water samples is described. In previous paper work, this technique was used for phenol determination with amperometric detection. In this modification, the use of a selective separation technique such as capillary zone electrophoresis (CZE) limits the necessity for obtaining a selective class separation with the extraction procedure. In this case, the same extract as used for phenols was analysed by CZE in phosphate buffer with UV detection, and the cationic species of interest, aromatic amines, were well separated from all the other non-ionic and anionic compounds. Experimental conditions for the use of CZE and the extraction technique are described. Different recoveries of aromatic amines in environmental samples, linearity and detection limits are discussed.