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 descr ibed. In previous paper work, this technique was used for phenol deter mination with amperometric detection. In this modification, the use of a selective separation technique such as capillary zone electrophores is (CZE) limits the necessity for obtaining a selective class separati on with the extraction procedure. In this case, the same extract as us ed for phenols was analysed by CZE in phosphate buffer with UV detecti on, and the cationic species of interest, aromatic amines, were well s eparated from all the other non-ionic and anionic compounds. Experimen tal conditions for the use of CZE and the extraction technique are des cribed. Different recoveries of aromatic amines in environmental sampl es, linearity and detection limits are discussed.