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A novel needle trap sorbent based on carbon nanotube-sol-gel for microextraction of polycyclic aromatic hydrocarbons from aquatic media

Bagheri, H ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.aca.2010.10.026
  3. Publisher: 2011
  4. Abstract:
  5. A new type of composite material based on carbon nanotubes (CNTs) and sol-gel chemistry was prepared and used as sorbent for needle trap device (NTD). The synthesized composite was prepared in a way to disperse CNTs molecules in a sol-gel polymeric network. CNT/silica composites with different CNT doping levels were successfully prepared, and the extraction capability of each composite was evaluated. Effects of surfactant and the oxidation duration of CNTs on the extraction efficiency of synthesized composites were also investigated. The applicability of the synthesized sorbent was examined by developing a method based on needle trap extraction (NTE) and gas chromatography mass spectrometry detection (GC-MS) for the determination of polycyclic aromatic hydrocarbons (PAHs) in aqueous samples. Important parameters influencing the extraction process were optimized and an extraction time of 30min at 50°C and sampling flow rate of 2.5mLmin-1 gave maximum peak area, when NaCl (15%, w/v) was added to the aqueous sample. The linearity for acenaphthene, acenaphthylene and fluorene was in the concentration range of 0.01-20ngmL-1 and for naphthalene and anthracene was in the range of 0.1-50ngmL-1. Limits of detection was 0.001ngmL-1, for acenaphthene, acenaphthylene and fluorene, and 0.01ngmL-1, for naphthalene and anthracene using time-scheduled selected ion monitoring (SIM) mode, and the RSD% values (n=3) were all below 11.2% at the 1ngmL-1 level. The developed method was successfully applied to real water samples while the relative recovery percentages obtained for the spiked water samples were from 73.8 to 113.8%
  6. Keywords:
  7. Acenaphthene ; Acenaphthylene ; Aquatic media ; Aqueous samples ; Concentration ranges ; Doping levels ; Extraction capability ; Extraction efficiencies ; Extraction process ; Extraction time ; Fluorenes ; Gas chromatography-mass spectrometry ; Limits of detection ; Maximum peaks ; Microextraction ; Needle trap devices ; Polycyclic aromatics ; Polymeric networks ; Selected ion monitoring ; Sol-gel chemistry ; Spiked water samples ; Trap extraction ; Water samples ; Anthracene ; Aromatic hydrocarbons ; Aromatization ; Carbon nanotubes ; Fluorine containing polymers ; Gas chromatography ; Gels ; Mass spectrometry ; Naphthalene ; Needles ; Organic compounds ; Sodium chloride ; Sol-gel process ; Sol-gels ; Sols ; Sorption ; Surface active agents ; Synthesis (chemical) ; Extraction ; Naphthalene derivative ; Polycyclic aromatic hydrocarbon ; Silicon dioxide ; Surfactant ; Unclassified drug ; Aqueous solution ; Composite material ; Concentration (parameters) ; Mass fragmentography ; Nanotechnology ; Needle trap extraction ; Oxidation ; Polymerization ; Priority journal ; Process design ; Process development ; Process optimization ; Reaction time ; Separation technique ; Sol gel technology ; Synthesis ; Temperature sensitivity ; Water sampling ; Water analysis
  8. Source: Analytica Chimica Acta ; Volume 683, Issue 2 , January , 2011 , Pages 212-220 ; 00032670 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S000326701001336X