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A Sol-Gel-bonded Coating Deposited on the Surface of Stainless Steel Wire for Solid Phase Microextraction of Environmental Pollutants

Hosseini Nasab, Valiallah | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43997 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib; Es-haghi, Ali
  7. Abstract:
  8. A novel SPME fiber was prepared using sol-gel technology with ethoxylated nonylphenol as a precursor and used for development of a headspace solid phase microextraction coupled with gas chromatography-mass spectrometry method for quantification of 13 priority polycyclic aromatic hydrocarbons in water samples. The fused silica is the material that has recently been used as a substrate in sol-gel works for preparation of SPME fibers. Given that its drawbacks such as breakability and fragility which make the work tedious and time consuming¬, in this survey stainless steel wires were chosen as a substrate for coating the sol-gel film on them. The fibers made from steel are vary sturdy and aren’t broken simply. The images prepared by scanning electron microscope (SEM) showed high porous and nano size particles film. Important parameters affecting extraction recoveries and efficiency such as extraction temperature, extraction time, desorption temperature and time and ionic strength was evaluated and extraction time of 25 min in 70 oC was chosen. In the next step, the validation of method was done and observed the method is very specific in trace analysis of PAHs, with limit of detection range from 0.01-0.5 µg L-1, linear range from limit of quantification to 200 µg L-1. The thermal stability of nonylphenol fiber was also investigated. Even after being put for 345 minute at 280°C, the extraction efficiency of the nonylphenol fiber didn’t decline, showing a high durability. The proposed method successfully utilized for quantification of PAHs in real water samples. Good results from prospective of relative recovery were obtained. The following pictures show scanning electron microscope micrographs for ethoxylated nonylphenol fibers
  9. Keywords:
  10. Solid Phase Microextraction ; Sol-Gel Method ; Gas Chromatography/Mass Spectrometry (GC/MS) ; Environmental Pollutant

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