title: Rational design of heteropolyacid-based nanosorbent for hollow fiber solid phase microextraction of organophosphorus residues in hair samples.
abstract: A novel heteropolyacid-based supported ionic liquid (IL) mediated sol-gel hybrid organic-inorganic material is presented for effective use in hollow fiber solid phase microextraction (HF-SPME). We examined a Keggin-based IL that was evaluated in conjunction with sol-gel. This study shows that Keggin-based IL sol-gel generated porous morphology pro effective extraction media. The method was developed for the extraction of the organophosphorus pesticides (OPs); diazinon, fenitrothion and malathion from human hair samples. The OPs were subsequently analyzed with high performance liquid chromatography and photodiode array detection (HPLC-PDA). In the basic condition (pH 10-11), the gel growth process in the presence of IL was initiated. Afterward, this 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 0.02-50,000 μg/g and 0.0001-25,000 ng/mL with detection limits between 0.0074-1.3000 μg/g and 0.00034-0.84 ng/mL for the OPs in hair and aqueous matrices, respectively. The relative recoveries in the real samples, for OPs in the storekeeper hair ranged from 86 to 95.2%.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Birjand University, Birjand, Iran.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Ebrahimi
authors.forename: Zarrin
authors.initials: Z
authors.lastname: Es'haghi
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Samadi
authors.forename: Fatemeh Farrash
authors.initials: FF
authors.lastname: Bamoharram
authors.forename: Mohammad-Saeid
authors.initials: MS
authors.lastname: Hosseini
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006197:Hair / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D052578:Ionic Liquids / Q000737:chemistry; D057230:Limit of Detection; D000432:Methanol / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000032:analysis* / Q000302:isolation & purification; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D012965:Sodium Chloride / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D052578:Ionic Liquids; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D012965:Sodium Chloride; D000432:Methanol