Sol-gel-based silver nanoparticles-doped silica - Polydiphenylamine nanocomposite for micro-solid-phase extraction

Bagheri, H ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.aca.2015.06.012
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. A nanocomposite of silica-polydiphenylamine doped with silver nanoparticles (Ag-SiO2-PDPA) was successfully synthesized by the sol-gel process. For its preparation, PDPA was mixed with butanethiol capped Ag nanoparticles (NPs) and added to the silica sol solution. The Ag NPs were stabilized as a result of their adsorption on the SiO2 spheres. The surface characteristic of nanocomposite was investigated using scanning electron microscopy (SEM). In this work the Ag-SiO2-PDPA nanocomposite was employed as an efficient sorbent for micro-solid-phase extraction (μ-SPE) of some selected pesticides. An amount of 15 mg of the prepared sorbent was used to extract and determine the representatives from organophosphorous, organochlorine and aryloxyphenoxy propionic acids from aqueous samples. After the implementation of extraction process, the analytes were desorbed by methanol and determined using gas chromatography-mass spectrometry (GC-MS). Important parameters influencing the extraction and desorption processes such as pH of sample solution, salting out effect, type and volume of the desorption solvent, the sample loading and eluting flow rates along with the sample volume were experimentally optimized. Limits of detection (LODs) and the limits of quantification (LOQs) were in the range of 0.02-0.05 μg L-1 and 0.1-0.2 μg L-1, respectively, using time scheduled selected ion monitoring (SIM) mode. The relative standard deviation percent (RSD %) with four replicates was in the range of 6-10%. The applicability of the developed method was examined by analyzing different environmental water samples and the relative recovery (RR %) values for the spiked water samples were found to be in the range of 86-103%
  6. Keywords:
  7. Pesticides ; Sol-gel process ; Chemical analysis ; Chromatography ; Desorption ; Gas chromatography ; Ionization of gases ; Mass spectrometry ; Metal nanoparticles ; Nanocomposites ; Nanoparticles ; Phase separation ; Silver ; Spectrometry ; Synthesis (chemical) ; Environmental water samples ; Gas chromatography-mass spectrometries (GC-MS) ; Relative standard deviations ; Selected ion monitoring ; Silver nanoparticles ; Surface characteristics ; Extraction ; Aryloxyphenoxy propionic acid ; Methanol ; Organochlorine pesticide ; Organophosphorus compound ; Polydiphenylamine nanocomposite ; Propionic acid ; Silica nanoparticle ; Silicon dioxide ; Sorbent ; Unclassified drug ; Adsorption kinetics ; Chemical modification ; Controlled study ; Flow rate ; Limit of detection ; Limit of quantitation ; Mass fragmentography ; Micro solid phase extraction ; PH measurement ; Priority journal ; Scanning electron microscopy ; Solid phase extraction ; Surface property ; Water sampling
  8. Source: Analytica Chimica Acta ; Volume 886 , July , 2015 , Pages 56-65 ; 00032670 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0003267015008077