title: Determination of nonylphenol ethoxylate oligomers by liquid chromatography-electrospray mass spectrometry in river water and non-ionic surfactants.
abstract: Liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) for the quantitative determination of five nonylphenol ethoxylate (NPE) oligomers in river water was described. These NPE oligomers were separated on a poly(vinyl alcohol) gel column using acetonitrile-30 mM ammonium acetate as the mobile phase followed by ESI-MS detection without any sample concentration steps. The sample was only filtered using the disposable filter and the aliquot (100 micro1) of this sample was injected into the LC-ESI-MS system. All NPE oligomers were detected using the [M+NH4]-ion. Detection limits ranged from 160 pg/ml (NPE4) to 240 pg/ml (NPE2), repeatability and reproducibility ranged from 4.2% (NPE2) to 6.2% (NPE6) and from 7.4% (NPE5) to 9.8% (NPE6).
authors.affiliation: Yokogawa Analytical Systems Inc., Osaka, Japan. masahiko_takino@agilent.com
authors.forename: M
authors.initials: M
authors.lastname: Takino
authors.forename: S
authors.initials: S
authors.lastname: Daishima
authors.forename: K
authors.initials: K
authors.lastname: Yamaguchi
mesh_terms: D002850:Chromatography, Gel / Q000379:methods*; D005026:Ethylene Glycols / Q000032:analysis*; D005618:Fresh Water / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013501:Surface-Active Agents / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005026:Ethylene Glycols; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C021754:terics