title: Determination of endocrine disruptors in water after derivatization with N-methyl-N-(tert.-butyldimethyltrifluoroacetamide) using gas chromatography with mass spectrometric detection.
abstract: The combined gas chromatographic determination of a number of hydroxyl-group containing endocrine disruptors, including 4-octylphenol, 4-nonylphenol, 2,4-dichlorophenol, pentachlorophenol, 4-tert.-butylbenzoic acid, bisphenol-A, 17beta-estradiol and 17alpha-ethynylestradiol, was investigated. Derivatization, required for sensitive determination of these compounds, was carried out using N-methyl-N-(tert.-butyldimethyltrifluoroacetamide). A number of parameters affecting the derivatization reaction, like temperature, time, matrix, solvent, and amount of reagent were studied in detail. Quantitative yields were obtained for real-life extracts after optimization, but the hormones were only mono-substituted. Both solid-phase extraction (SPE) and liquid-liquid extraction were studied as extraction methods, with emphasis on SPE material and effect of pH. Recoveries and RSD for analysis of surface water samples were 58-106 and 6-16% (n=4), respectively, when using SPE, and 109-117 and 6-14% (n=6) when using liquid-liquid extraction. The method developed allows routine analysis of surface water for traces of endocrine disruptors. The limits of detection of were 4-6 ng/l but higher for the hormones.
authors.affiliation: TNO Nutrition and Food Research Institute, Department of Pesticides and Industrial Chemistry, Zeist, The Netherlands.
authors.forename: H G
authors.initials: HG
authors.lastname: Mol
authors.forename: S
authors.initials: S
authors.lastname: Sunarto
authors.forename: O M
authors.initials: OM
authors.lastname: Steijger
mesh_terms: D004702:Endocrine Glands / Q000187:drug effects*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D015262:Xenobiotics / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D015262:Xenobiotics