title: Novel double-confined polymeric ionic liquids as sorbents for solid-phase microextraction with enhanced stability and durability in high-ionic-strength solution.
abstract: Because of the occurrence of ion exchange between high-ionic-strength solution and anions of polymeric ionic liquids (PILs), PILs based solid-phase microextraction (SPME) fibers were rarely used in direct immersion mode to high-salt-added samples. In this work, a novel double-confined PIL sorbent was prepared by co-polymerization of cation and anion of 1-vinyl-3-octylimidzaolium p-styrenesulfonate (VOIm(+)SS(-)). The poly(VOIm(+)-SS(-)) was chemically bonded onto functionalized stainless steel wire via surface radical chain-transfer reaction. Stability of poly(VOIm(+)-SS(-)) in high-ionic-strength solution was investigated and compared with that of poly(1-vinyl-3-octylimidzaolium benzenesulfonate) (poly(VOIm(+)BS(-))) by elemental analysis of sulfur element, and results turned out that the poly(VOIm(+)-SS(-)) was more stable. Coupled to gas chromatography (GC), the poly(VOIm(+)-SS(-)) fiber was used to extract three sorts of compounds including anilines, phenols and phthalate esters in aqueous solution. The as-established method showed good linearity, low detection limits, and acceptable repeatability. The direct immersion SPME-GC method was applied to determine the model phthalate esters in bottled mineral water. The determination results were satisfactory.
authors.affiliation: Key Laboratory of Chemistry of Northwestern Plant Resources, CAS/Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Feng
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.forename: Lili
authors.initials: L
authors.lastname: Xu
authors.forename: Shuai
authors.initials: S
authors.lastname: Wang
authors.forename: Xia
authors.initials: X
authors.lastname: Liu
authors.forename: Shengxiang
authors.initials: S
authors.lastname: Jiang
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry / Q000302:isolation & purification; D002849:Chromatography, Gas; D060766:Drinking Water / Q000032:analysis*; D052578:Ionic Liquids / Q000737:chemistry; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification; D010795:Phthalic Acids / Q000737:chemistry / Q000302:isolation & purification; D011108:Polymers / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000814:Aniline Compounds; D060766:Drinking Water; D052578:Ionic Liquids; D010636:Phenols; D010795:Phthalic Acids; D011108:Polymers; D014874:Water Pollutants, Chemical; C032279:phthalic acid; C023650:aniline