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Nanomagnetic Polyamidoamine Dendrimer as A Novel Sorbent for Solid Phase Microextraction of Chlorophenols from Aquatic Media

Manouchehri, Mahshid | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47631 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib
  7. Abstract:
  8. In this study, ananomagnetic polyamidoamine (PAMAM) dendrimer was synthesized as a novel SPME fiber coating and implemented to the determination of traces of chlorophenols in water samples. The synthesized magnetic PAMAM shows to have many polar groups with an enhanced internal porosity which is promising to be used as an efficient extracting medium. With this purpose, a thin stainless steel wire was coated by the network of dendritic PAMAM polymer through electrolysis and chemical reactions. The synthesized fiber is physical stable since it was chemically bonded to the substrate. Extraction efficiency of new coating was investigated by headspace SPME of chlorophenols from aqueous samples followed by gas chromatography–mass spectrometry determination.Figures of merit of the developed method was also obtained in which the linearity for the analytes was in the range of 2-1000 ng L-1. The values of LOD (S/N= 3) for analytes were between0.6 to 10 ng L-1. The RSD% values in spiked distillated water samples(n=3)were all below 7% at the 100 ng L-1level and the RSD% of fiber to fiber at the same concentration were below 9%. The developed method was successfully applied to tap, well and Caspian sea water samples while the relative recovery percentage obtained for the spiked tap water samples was from 82 to 97%, for well water samples was from 84to 98 % and for the caspian sea water samples was from 80 to 93%. With this results, because of the developed method has good repeatability, sensitivity, long life and physical stability so it can be used as a suitable technique in analysis of environmental pollutants. Another point is that the dendritic polymers with plenty of functional groups can be modified to be used for more desired extractions
  9. Keywords:
  10. Solid Phase Microextraction ; Chlorophenols ; Gas Chromatography/Mass Spectrometry (GC/MS) ; Dendrimers ; Equeous Media ; Polyamidoamine

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