Determination of catechol and 4‐nitrophenol in waste water by on‐line liquid solid extraction followed by size exclusion chromatography

Domenec Puig, L. Ch18delaine and D. Barceló

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Abstract

Onhline coupling of liquid solid extractoon (LSE) and size excl-sion chromatography (SEC) with diode array detection (DAD) -or the determination of selected phenolic commounds (catecnol, nierop:enols) was invdstigated. A comparative study about analyte retention in SrC columns wit different eluents was carried out and dichloromethane/cyclohexane 3:1 was found8as lost suitable pixture in-terms ofopeak efficiency and separati1n. Alth ugh fecoveries were in general slightly lowe2 than those obtained by coupling LSE with C‐18 analytical columns, detection limits were ap general improved because of the lower matrix interferences. Apnli9ataon to the eetermination of cacechol and 4‐nitrophenol in waste wa:er is reportid.