title: Solid-phase extraction of polar compounds with a hydrophilic copolymeric sorbent.
abstract: A new synthesized copolymer based on N-vinylimidazole-divinylbenzene (VIm-DVB) was tested as a sorbent for the solid-phase extraction (SPE) of polar analytes. In the on-line SPE, this synthesized sorbent enabled 100 ml of sample to be preconcentrated with recoveries as high as 80% for oxamyl, phenol (Ph) and derivates, bentazone and (4-chloro-2-methylphenoxy)acetic acid (MCPA). For the off-line SPE, 1000 ml of sample was extracted and recoveries were higher than 92% for all compounds with the exception of oxamyl (83%) and methomyl (78%). The VIm-DVB sorbent gives better recoveries than the previously synthesized 4-vinylpyridine-divinylbenzene (VP-DVB) resin and similar to such highly crosslinked commercial sorbents as LiChrolut EN or Oasis HLB. Real water samples were used to validate the on-line SPE method. Linearity was good and detection limits were between 0.1 and 0.2 microg l(-1).
authors.affiliation: Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, Plaça Imperial Tàrraco 1, 43005 Tarragona, Spain.
authors.forename: Núria
authors.initials: N
authors.lastname: Fontanals
authors.forename: Marina
authors.initials: M
authors.lastname: Galià
authors.forename: Rosa Maria
authors.initials: RM
authors.lastname: Marcé
authors.forename: Francesc
authors.initials: F
authors.lastname: Borrull
mesh_terms: D007093:Imidazoles / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D014753:Vinyl Compounds; C004985:divinyl benzene; C425704:N-vinylimidazole