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Title: New Nanostructure of Polydimethylsiloxane Coating as a Solid-Phase Microextraction Fiber: Application to Analysis of Btex in Aquatic Environmental Samples
Journal: Journal of Chromatography B
Author: 1. Fahimeh Jalali, Mojtaba Shamsipur, 1,2. Sara Zali, 2. Ali Es-haghi
Year: 2016
Address: 1. Department of Chemistry, Razi University, Kermanshah, Iran 2. Department of Physico Chemistry, Razi Vaccine & Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), P.O.Box 31975/148, Karaj, Iran
Abstract: tElectrospinning technique was used to convert polydimethyl siloxane (PDMS) sol-gel solution to a newnanostructure on a stainless steel wire. The surface morphology of the fiber was observed by scanningelectron microscopy (SEM). It showed a diameter range of 30–60 nm for PDMS nanoparticles with a homo-geneous and porous surface structure. The applicability of this coating was assessed for the headspaceSPME (HS-SPME) of benzene, toluene, ethylbenzene and xylenes (BTEX) from water samples followedby gas chromatography–mass spectrometry. The important parameters affecting extraction efficiencysuch as extraction time and temperature, desorption conditions, agitation rate and ionic strength wereinvestigated and optimized.Under the optimized conditions, LODs and LOQs of 0.3–5 gL−1and 1–10 gL−1were obtained, respec-tively. The method showed linearity in the broad range of 1–5000 gL−1with correlation coefficient of>0.99. Inter-day and intra-day precisions of the developed method ranged from 2.43% to 6.54% and from5.24% to 13.73%, respectively. The thermal stability of the fiber was investigated on stainless steel wire.It was found to be durable at 260◦C for more than 360 min. Furthermore, the proposed method wassuccessfully applied for quantification of BTEX in real water samples.
Keywords: PolydimethylsiloxaneElectrospraySolid phase microextractionBTEXGas chromatography–mass spectrometrya
Application: Extraction
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