AMBERLITE XAD-2 RESIN MICROCOLUMN COUPLED ONLINE TO A FLOW-INJECTION APPROACH FOR THE PRECONCENTRATION, CLEANUP AND DETERMINATION OF TRACE PHENOLS IN WATERS

A novel and expeditious approach for direct determination of phenols i n water and waste water based on solid-phase extraction coupled to a f low injection analysis (FIA) manifold is described. The method employs on-line preconcentration of phenols using a 3 cm X 3 mm column packed with Amberlite XAD-2 resin. The phenols are subsequently eluted from the resin into a flowing system with an alkaline solution and quantifi ed spectrophotometrically as the products of reaction with 4-aminoanti pyrine (4-AAP) system. The sensitivity offered by the procedure was hi gher by a factor of pH=13 than that provided by a conventional FIA met hod.