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Polyaniline Nanowire Networks as Sorbent for Microextraction in Packed Syringes

Alipour, Noshin | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42334 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib
  7. Abstract:
  8. A simple, fast and sensitive method based on microextraction in packed syringe (MEPS), a new format of solid-phase extraction (SPE), as a sample preparation technique in off-line combination with gas chromatography-mass spectrometry (GC-MS) was developed. Polyaniline (PANI) nanowire network was synthesized and used as sorbent of MEPS for the multiresidue determination of selected analytes from triazine, organochlrorine and organophosphorous pesticides in aqueous samples. The PANI nanowires network was prepared using soft template technique and its characterization was studied by scanning electron microscopy (SEM). The use of micelles in this methodology has an important role in the shape of the growing polymer. The aniline monomers were introduced into cetyltrimethylammonium bromide (CTAB) micelles and this was led to the formation of nanowires with diameters ranging from 35 to 45 nm. PANI nanowire network has shown higher extraction capability in comparison with the bulk PANI. Important parameters influencing the extraction and desorption processes including desorption solvent, elution volume, draw-eject cycles of sample, draw-eject mode, pH effect and amount of sorbent were optimized. Limits of detection were in the range of 0.07 to 0.3 ng mL-1 using time scheduled selected ion monitoring (SIM) mode. The linearity of method was in the range of 0.5-200 to 0.2-1000 ng mL-1. The method precision (RSD %) with three replicates were in the range of 5.3-18.4 % at concentration level of 5 ng mL-1. The developed method was successfully applied to Zayandeh-roud river water samples while the matrix factor obtained for the spiked real water samples were in the range of 0.79-0.94
  9. Keywords:
  10. Gas Chromatography/Mass Spectrometry (GC/MS) ; polyaniline Nonowire Network ; Soft Template Technique ; Microextraction in Packed Syringe (MEPS) ; Multiresidue Determination

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