title: Hollow fiber supported ionic liquid membrane microextraction for determination of sulfonamides in environmental water samples by high-performance liquid chromatography.
abstract: By using ionic liquid as membrane liquid and tri-n-octylphosphine oxide (TOPO) as additive, hollow fiber supported liquid phase microextraction (HF-LPME) was developed for the determination of five sulfonamides in environmental water samples by high-performance liquid chromatography with ultraviolet detection The extraction solvent and the parameters affecting the extraction enrichment factor such as the type and amount of carrier, pH and volume ratio of donor phase and acceptor phase, extraction time, salt-out effect and matrix effect were optimized. Under the optimal extraction conditions (organic liquid membrane phase: [C(8)MIM][PF(6)] with 14% TOPO (w/v); donor phase: 4mL, pH 4.5 KH(2)PO(4) with 2M Na(2)SO(4); acceptor phase: 25microL, pH 13 NaOH; extraction time: 8 h), low detection limits (0.1-0.4microg/L, RSD<or=5%) and good linear range (1-2000ng/mL, R(2)>or=0.999) were obtained for all the analytes. The presence of humic acid (0-25mg/L dissolved organic carbon) and bovine serum albumin (0-100microg/mL) had no significant effect on the extraction efficiency. Good spike recoveries over the range of 82.2-103.2% were obtained when applying the proposed method on five real environmental water samples. These results indicated that this present method was very sensitive and reliable with good repeatabilities and excellent clean-up in water samples. The proposed method confirmed hollow fiber supported ionic liquid membrane based LPME to be robust to monitoring trace levels of sulfadiazine, sulfamerazine, sulfamethazine, sulfadimethoxine and sulfamethoxazole in aqueous samples.
authors.affiliation: School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Tao
authors.forename: Jing-Fu
authors.initials: JF
authors.lastname: Liu
authors.forename: Xia-Lin
authors.initials: XL
authors.lastname: Hu
authors.forename: Hong-Cheng
authors.initials: HC
authors.lastname: Li
authors.forename: Thanh
authors.initials: T
authors.lastname: Wang
authors.forename: Gui-Bin
authors.initials: GB
authors.lastname: Jiang
mesh_terms: D053000:Analytic Sample Preparation Methods; D000900:Anti-Bacterial Agents / Q000032:analysis* / Q000302:isolation & purification; D002138:Calibration; D005591:Chemical Fractionation / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D005618:Fresh Water / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles; D007220:Industrial Waste; D052578:Ionic Liquids; D009943:Organophosphorus Compounds; D009994:Osmolar Concentration; D012997:Solvents; D013449:Sulfonamides / Q000032:analysis* / Q000302:isolation & purification; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: C446740:1-octyl-3-methylimidazolium hexafluorophosphate; D000900:Anti-Bacterial Agents; D007093:Imidazoles; D007220:Industrial Waste; D052578:Ionic Liquids; D009943:Organophosphorus Compounds; D012997:Solvents; D013449:Sulfonamides; D014874:Water Pollutants, Chemical; C044965:trioctyl phosphine oxide