title: Development and application of a new solid-phase microextraction fiber by sol-gel technology on titanium wire.
abstract: Novel solid-phase microextraction fibers were prepared based on sol-gel technique. Commonly used fused silica substrate was replaced by titanium wire which provided high strength and longer fiber life cycle. Titanium isopropoxide was employed as the precursor which provides a sol solution containing Ti-OH groups and shows more tendencies to the molecularly similar group on the substrate. Three different polymers, poly (dimethylsiloxane) (PDMS), poly(ethylenepropyleneglycol)-monobutyl ether (Ucon) and polyethylene glycol (PEG) were employed as coating polymer in preparing three different fibers. The applicability of these fibers was assessed for the headspace SPME (HS-SPME) of benzene, toluene, ethylbenzene and xylenes (BTEX) from water sample followed by gas chromatography-mass spectrometry (GC-MS). Effects of different parameters such as fiber coating type, extraction condition, desorption condition were investigated and optimized. Under the optimized conditions, LODs and LOQs of 0.75-10 μg L(-1) (S/N=3) and 1-20 μg L(-1) (S/N=10) were respectively obtained. The method showed linearity in the range of 10-25,000 μg L(-1) with correlation coefficient of >0.99. The relative standard deviation was less than 8%.
authors.affiliation: Department of Physico Chemistry, Razi Vaccine & Serum Research Institute, Karaj, Iran. a.eshaghi@rvsri.ir
authors.forename: Ali
authors.initials: A
authors.lastname: Es-haghi
authors.forename: Seyed Maryam
authors.initials: SM
authors.lastname: Hosseini
authors.forename: Zahra Monsef
authors.initials: ZM
authors.lastname: Khoshhesab
mesh_terms: D001555:Benzene Derivatives / Q000032:analysis*; D002138:Calibration; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004987:Ethers / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D009942:Organometallic Compounds / Q000737:chemistry*; D044367:Phase Transition; D011092:Polyethylene Glycols / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000379:methods
chemical_list: D001555:Benzene Derivatives; D004129:Dimethylpolysiloxanes; D004987:Ethers; D009942:Organometallic Compounds; C501377:poly(ethylenepropyleneglycol) monobutyl ether; D011092:Polyethylene Glycols; C013830:baysilon; C102815:titanium isopropoxide