title: Analysis of perfluorooctane sulfonate and perfluorooctanoic acid with a mixed-mode coating-based solid-phase microextraction fiber.
abstract: A novel mixed-mode coating-based solid-phase microextraction (SPME) fiber was prepared by chemical bonding dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride and 3-(trimethoxysilyl)-1-propanamine, the sol-gel precursors, on an anodized Ti wire, aiming to effectively adsorb perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA). The anodized Ti wire with uniform TiO2 nanotube arrays provides high mechanical strength and strong adhesion to the mixed-mode coating. The prepared fiber shows excellent organic solvent stability due to the covalent bonding between the coating and the fiber, and significantly higher extraction efficiency than the commercial fibers, 100 μm polydimethylsiloxane and 85 μm polyacrylate fiber, due to the synergistic extraction effects of the coating functional groups. Good linearity (R(2)=0.9994 for PFOS, R(2)=0.9992 for PFOA) was obtained with detection limits of 2.5 and 7.5 pg mL(-1) for PFOS and PFOA, respectively. Recoveries were in the range of 88%-102%. The proposed method was successfully applied in the analysis of PFOS and PFOA in a local river with the results of 0.05 and 0.06 ng mL(-1), respectively.
authors: State Key Laboratory of Chemo/Biosensing & Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha 410082, China.
authors: Chunyan
authors: C
authors: Chen
authors: Jianping
authors: J
authors: Wang
authors: Shaolei
authors: S
authors: Yang
authors: Zhihong
authors: Z
authors: Yan
authors: Qingyun
authors: Q
authors: Cai
authors: Shouzhuo
authors: S
authors: Yao
mesh_terms: D017738:Alkanesulfonic Acids / Q000032:analysis*; D001548:Benzalkonium Compounds / Q000737:chemistry; D002210:Caprylates / Q000032:analysis*; D002681:China; D005466:Fluorocarbons / Q000032:analysis*; D011437:Propylamines; D045483:Rivers / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D017738:Alkanesulfonic Acids; D001548:Benzalkonium Compounds; D002210:Caprylates; D005466:Fluorocarbons; D011437:Propylamines; D012821:Silanes; D014874:Water Pollutants, Chemical; C023036:perfluorooctanoic acid; C076994:perfluorooctane sulfonic acid; D014025:Titanium; C477625:amino-propyl-triethoxysilane
keywords: Mixed-mode coating; Perfluorooctane sulfonate; Perfluorooctanoic acid; Solid-phase microextraction