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A routine method Is described for the quantitative determination of 4-nonylphenol (NP) and 4-nonylphenol mono-(NP1EO) and dlethoxylate (NP2EO) In samples from wastewater and sludge treatment and from the aquatic environment. An exhaustive steam-dlstlllation/solvent-extractlon procedure was employed to enrich the analytes from aqueous and solid samples. Quantitative determinations were performed by normal-phase high-performance liquid chromatography (HP-LC) using amlnoslllca columns. Relative standard deviations were 3.0-4.4% In a river water containing 3.9 pg/Lnp, 23.4 pg/Lnp1eo, and 9.4 pg/Lnp2eo. A digestedsewage sludge with 1.6 g of NP/kg of dry matter was analyzed with a relative standard deviation of 3.7%. Recoveries were higher than 80%, and the estimated detection limit In water samples was 0.5 pg/L. Reversed-phase HPLC on octylsillca provided complementary qualitative data …