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Reinforced polydiphenylamine nanocomposite for microextraction in packed syringe of various pesticides

Bagheri, H ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.chroma.2011.11.063
  3. Publisher: 2012
  4. Abstract:
  5. Reinforced polydiphenylamine (PDPA) nanocomposite was synthesized by oxidation of diphenylamine in 4molL-1 sulfuric acid solution containing a fixed amount of carbon nanotubes (CNTs) in the presence of cetyltrimethylammonium bromide (CTAB). The surface characteristic of PDPA and PDPA/CNT nanocomposites was investigated using scanning electron microscopy (SEM). The prepared PDPA/CNT nanocomposite was used as an extraction medium for microextraction in packed syringe (MEPS) of selected pesticides from aquatic environment. The effect of CNT doping level and the presence of surfactant on the extraction capability of nanocomposite was investigated and it was revealed that when 4% (w/w) of CNT in the presence of CTAB is being used, the highest extraction recovery could be achieved. Eventually, the developed MEPS technique in off-line combination with gas chromatography-mass spectrometry (GC-MS) was applied to the analysis of some pesticides including triazine, organophosphorous, organochlorine and aryloxyphenoxy propionic acid pesticides. Important parameters influencing the extraction and desorption processes were optimized and a 25 cycles of draw-eject gave maximum peak area, when desorption was performed using 200μL of n-hexane. Limits of detection (LODs) were in the range of 0.01-0.1ngmL-1 and 0.02-0.1ngmL-1 for distilled water and river water respectively, using time scheduled selected ion monitoring (SIM) mode. The method precision (RSD %) with four replicates was in the range of 1.6-14.6% for distilled water and 1.5-16.2% for river water at the concentration level of 5ngmL-1 while the linearity of method was in the range of 0.15-100 and 0.5-500ngmL-1. The developed method was successfully applied to different river water samples and the matrix factor for the spiked river water samples were found to be in the range of 0.74-1.09
  6. Keywords:
  7. Microextraction in packed syringe ; Multiresidue determination ; Polydiphenylamine/carbon nanotube nanocomposite ; Water analysis ; Aquatic environments ; Cetyltrimethylammonium bromide ; Concentration levels ; Desorption process ; Distilled water ; Doping levels ; Extraction capability ; Extraction medium ; Extraction recovery ; Gas chromatography-mass spectrometry ; Matrix ; Microextraction ; N-Hexane ; Organochlorines ; Organophosphorous ; Peak area ; Polydiphenylamine ; Propionic acids ; River water ; River water samples ; Selected ion monitoring ; Sulfuric acid solution ; Surface characteristics ; Agricultural chemicals ; Ammonium compounds ; Bromine compounds ; Carbon nanotubes ; Fatty acids ; Hexane ; Mass spectrometry ; Reinforced plastics ; Rivers ; Scanning electron microscopy ; Sulfuric acid ; Surface active agents ; Syringes ; Gas chromatography ; Ametryn ; Aryloxyphenoxy propionic acid ; Atrazine ; Cetrimide ; Chemical compound ; Clodinafop propargyl ; Dimpylate ; Endosulfan ; Environmental chemical ; Ethion ; Fenitrothion ; Fenoxyprop p ethyl ; Fenthion ; Haloxyfop etotyl ; Lindane ; Nanomaterial ; Organochlorine derivative ; Organophosphorus compound ; Pesticide ; Profenophos ; Surfactant ; Terbutryn ; Triazine ; Unclassified drug ; Composite material ; Concentration (parameters) ; Controlled study ; Desorption ; Ion monitoring ; Mass fragmentography ; Oxidation ; Priority journal ; Process development ; Process optimization ; Surface property ; Syringe ; Water sampling ; Diphenylamine ; Hydrogen-Ion Concentration ; Iran ; Limit of Detection ; Nanocomposites ; Nanotubes, Carbon ; Pesticide Residues ; Polymers ; Reproducibility of Results ; Solid Phase Microextraction ; Water Pollutants, Chemical
  8. Source: Journal of Chromatography A ; Volume 1222 , January , 2012 , Pages 13-21 ; 00219673 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0021967311017791