title: Concentration of nonylphenol and its polyethoxylated derivatives by polymer-mediated extraction.
abstract: Polymer-mediated extraction based on thermoresponsive precipitation of poly(N-isopropylacrylamide) [PNIPAAm] was applied to the concentration of amphiphilic compounds, nonylphenyl polyethoxylates (NPnEOs), in water. Among these nonionic surfactants, NPnEOs possessing the number, n, of ethoxy unit less than 5 were quantitatively recovered in polymer precipitates when a 0.100-g portion of PNIPAAm was used for a 10 ml sample solution. Torelance limit (30 ppm) against a typical industrial anionic surfactant, sodium dodecylsulfate, strongly suggests the potential to use the present method for practical purposes. After preconcentration, trace nonylphenol and mono-ethoxylated nonylphenol (ppb-level) in a river water sample were successfully determined by high-performance liquid chromatography with ultra-violet photometric detection.
authors.affiliation: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Japan. saitoh@numse.nagoya-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshida
authors.forename: C
authors.initials: C
authors.lastname: Matsubara
mesh_terms: D000838:Anions; D002851:Chromatography, High Pressure Liquid; D010636:Phenols / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D000838:Anions; D010636:Phenols; D011108:Polymers; D013501:Surface-Active Agents; D014867:Water; C025256:nonylphenol