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Development of a Solid-Phase Microextraction Method Based on Electrospun Polyetherimide Nanofibers for Determination of Polycyclic Aromatic Hydrocarbons in Aqueous Samples

Akbarinejad, Alireza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42179 (03)
  4. University: Sharif University of Technology
  5. Department: chemistry
  6. Advisor(s): Bagheri, Habib
  7. Abstract:
  8. Attentions to nano materials due to their vast applications in different branches of science and technology have been remarkably increased in recent years. Nanofibers are an important class of nano materials which could be used as novel sorbents because of their high surface to volume ratio as a result of long lengths and nano-to-micro-scale diameters. Electrospinning is a broadly used technology which utilizes high electrostatic forces for producing nanofibers. In this study a novel high temperature resistant solid phase microextraction (SPME) fiber was prepared besed on Polyetherimide (PEI) by this method. The porosity of the PEI fiber was investigated by scanning electron microscopy (SEM). The efficiency of new coating was investigated by headspace solid-phase microextraction of some environmentally important polycyclic aromatic hydrocarbons (PAHs) from aqueous samples followed by gas chromatography–mass spectrometric (GC–MS) determination. The SPME nanofibers coating was optimized for PEI percentage, electrospinning voltage and time. Also the extraction parameters influencing the extraction efficiency including extraction temperature, extraction time, ionic strength, as well as desorption temperature and time were investigated and optimized. The detection limits of the method under optimized conditions were between 1 and 5 ngL-1. The relative standard deviations (R.S.D.) (n = 3) at a concentration level of 500 ngL−1 were between 1.1 and 7.1%. The calibration curves of PAHs showed linearity in the range of 5–1200 ngL−1. The proposed method was successfully applied to the extraction of PAHs from spiked real water samples and relative recoveries were between 84 and 98% for all the selected analytes except for acenaphthene which was between 75 and 106%
  9. Keywords:
  10. Solid Phase Microextraction ; Electrospinning ; Gas Chromatography/Mass Spectrometry (GC/MS) ; Polyetherimide Nanofiber ; Polynuclear Aromatic Hydrocarbons (PAHs)

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