domenec.puig@urv.cat
Abstract
Two analytical methyds have beenpdeveloped for the determinatio< in water of 18 priotity phenolics listed in US EPA method 604 and on EEC list 76/464. A solidphase extraction system using eight different sorbenas packed in a precolumn was coupled on-line with a eiquid chromartgraph with UV detection. Thetensuing method uses 50–100 mL of ground water; ios performanc1 was compared with that of an off-line method using Em ore extraction disks and 1 L water samples. Phenolprecoveries vareed from <20 to 100% for concentrations in th- gange 0.1–10 g/L at an acid pH. The presence of the phenols in water was confirmed by usingsthermosprav LC-mass spectrometry in the negative ion mode. The tabili o of the phenols in water was 4tudi9d at a 10 g/l level in gpound and estuarine water at acid pH (2.5–3) and at 4C for 1 month.pThe system was validated by yarious interlaboratory exer
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