title: Ionic liquid mediated sol-gel sorbents for hollow fiber solid-phase microextraction of pesticide residues in water and hair samples.
abstract: An ionic liquid mediated sol-gel sorbents for hollow fiber solid-phase microextraction (HF-SPME) was developed for extraction of the pesticides: diazinon, fenitrothion, malathion, fenvalerate, phosalone and tridemorph from human hair and water samples. The analytes were subsequently analyzed with high performance liquid chromatography and diode array detection (HPLC-DAD). Preliminary experiments were carried out in order to study experimental conditions for pesticides' extraction from spiked hair and water samples with HF-SPME using hollow fiber-supported ionic liquid mediated sol-gel sorbent. The sol-gel nanocomposites were reinforced with nanoparticles such as carboxylic functionalized multi-walled carbon nanotubes (COOH-MWCNTs), amino functionalized multi-walled carbon nanotubes (NH(2)-MWCNTs), nano SiO(2), nano TiO(2) and nano MgO comparatively to promote extraction efficiency. In this device, the innovative solid sorbents were developed by the sol-gel method via the reaction of tetraethylorthosilicate (TEOS) with 2-amino-2-hydroxymethyl-propane-1,3-diol (TRIS). In the basic condition (pH 10-11), the gel growth process in the presence of ionic liquid and nanoparticles was initiated. Then, the sol was injected into a polypropylene hollow fiber segment for in situ gelation process. Parameters affecting the efficiency of HF-SPME were thoroughly investigated. Linearity was observed over a range of 0.01-25,000 ng/mL with detection limits between 0.004 and 0.095 ng/mL for the pesticides in the aqueous matrices and 0.003-0.080 ng/mL in the hair matrices. The relative recoveries in the real samples ranged from 82.0% to 94.0% for the pesticides store seller's hair and the work researchers' hair. Results are showing the great possibilities of HF-SPME-HPLC-PDA for analysis of pesticides in biological and environmental samples.
authors: Department of Chemistry, Faculty of Sciences, Birjand University, Birjand, Iran.
authors: Mahmoud
authors: M
authors: Ebrahimi
authors: Zarrin
authors: Z
authors: Es'haghi
authors: Fatemeh
authors: F
authors: Samadi
authors: Mohammad-Saeid
authors: MS
authors: Hosseini
mesh_terms: D002851:Chromatography, High Pressure Liquid; D006197:Hair / Q000737:chemistry*; D006801:Humans; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D016014:Linear Models; D008297:Male; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis / Q000302:isolation & purification*; D044367:Phase Transition; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052617:Solid Phase Microextraction / Q000295:instrumentation* / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry*
chemical_list: C540528:1-butyl-3-methylimidazolium hydroxide; D007093:Imidazoles; D052578:Ionic Liquids; D037742:Nanotubes, Carbon; D010573:Pesticide Residues; D014867:Water