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Abstract.Solid phase extraction of mixtures of phenol 3 monochlorophenols, 4 dichlorophenols, 3 methyl-4-chlorophenol, 4 trichlorophenols, 2 tetrachlorophenols and pentachlorophenol was studied on octadecylsilica (Separon SGX C18) and Amberlite XAD 2 in the presence of hexadecyltrimethylammonium chloride (CTMA) in alkaline medium, and their efficiency for the preconcentration of phenols was compared...