PMID- 21782185
OWN - NLM
STAT- MEDLINE
DCOM- 20111010
LR  - 20191210
IS  - 1873-3778 (Electronic)
IS  - 0021-9673 (Linking)
VI  - 1218
IP  - 34
DP  - 2011 Aug 26
TI  - A novel solid-phase microextraction using coated fiber based sol-gel technique 
      using poly(ethylene glycol) grafted multi-walled carbon nanotubes for 
      determination of benzene, toluene, ethylbenzene and o-xylene in water samples 
      with gas chromatography-flame ionization detector.
PG  - 5757-64
LID - 10.1016/j.chroma.2011.06.099 [doi]
AB  - In this study, poly(ethylene glycol) (PEG) grafted onto multi-walled carbon 
      nanotubes (PEG-g-MWCNTs) were synthesized by the covalent functionalization of 
      MWCNTs with hydroxyl-terminated PEG chains. For the first time, functionalized 
      product of PEG-g-MWCNTs was used as selective stationary phase to prepare the 
      sol-gel solid-phase microextraction (SPME) fiber in combination with gas 
      chromatography-flame ionization detector (GC-FID) for the determination of 
      ultra-trace levels of benzene, toluene, ethylbenzene and o-xylene (BTEX) in real 
      water samples. The PEG-g-MWCNTs were characterized by Fourier transform infrared 
      spectra and also thermo-gravimetric analysis, which verified that PEG chains were 
      grafted onto the surface of the MWCNTs. The scanning electron micrographs of the 
      fiber surface revealed a highly porous structure which greatly increases the 
      surface area for PEG-g-MWCNTs sol-gel coating. This fiber demonstrated many 
      inherent advantages, the main being the strong anchoring of the coating to the 
      fused silica resulting from chemical bonding with the silanol groups on the 
      fused-silica fiber surface. The new PEG-g-MWCNTs sol-gel fiber is simple to 
      prepare, robust, with high thermal stability and long lifetime, up to 200 
      extractions. Important parameters influencing the extraction efficiency such as 
      desorption temperature and time, extraction temperature, extraction time, 
      stirring speed and salt effect were investigated and optimized. Under the optimal 
      conditions, the method detection limits (S/N=3) were in the range of 0.6-3 pg 
      mL(-1) and the limits of quantification (S/N=10) between 2 and 10 pg mL(-1). The 
      relative standard deviations (RSDs) for one fiber (repeatability) (n=5) were 
      obtained from 4.40 up to 5.75% and between fibers or batch to batch (n=3) 
      (reproducibility) in the range of 4.31-6.55%. The developed method was 
      successfully applied to real water samples while the relative recovery 
      percentages obtained for the spiked water samples at 20 pg mL(-1) were from 90.21 
      to 101.90%.
CI  - Copyright (c) 2011 Elsevier B.V. All rights reserved.
FAU - Sarafraz-Yazdi, Ali
AU  - Sarafraz-Yazdi A
AD  - Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, 
      Iran. asyazdi@um.ac.ir
FAU - Amiri, Amirhassan
AU  - Amiri A
FAU - Rounaghi, Gholamhossein
AU  - Rounaghi G
FAU - Hosseini, Hossein Eshtiagh
AU  - Hosseini HE
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110703
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Benzene Derivatives)
RN  - 0 (Nanotubes, Carbon)
RN  - 0 (Water Pollutants, Chemical)
RN  - 0 (Xylenes)
RN  - 3FPU23BG52 (Toluene)
RN  - 3WJQ0SDW1A (Polyethylene Glycols)
RN  - J64922108F (Benzene)
RN  - L5I45M5G0O (ethylbenzene)
RN  - Z2474E14QP (2-xylene)
SB  - IM
MH  - Adsorption
MH  - Benzene/*analysis/isolation & purification
MH  - Benzene Derivatives/*analysis/isolation & purification
MH  - Chromatography, Gas/instrumentation/*methods
MH  - Nanotubes, Carbon/chemistry
MH  - Polyethylene Glycols/chemistry
MH  - Solid Phase Microextraction/instrumentation/*methods
MH  - Toluene/*analysis/isolation & purification
MH  - Water Pollutants, Chemical/*analysis/isolation & purification
MH  - Xylenes/*analysis/isolation & purification
EDAT- 2011/07/26 06:00
MHDA- 2011/10/11 06:00
CRDT- 2011/07/26 06:00
PHST- 2011/04/19 00:00 [received]
PHST- 2011/06/23 00:00 [revised]
PHST- 2011/06/26 00:00 [accepted]
PHST- 2011/07/26 06:00 [entrez]
PHST- 2011/07/26 06:00 [pubmed]
PHST- 2011/10/11 06:00 [medline]
AID - S0021-9673(11)00940-X [pii]
AID - 10.1016/j.chroma.2011.06.099 [doi]
PST - ppublish
SO  - J Chromatogr A. 2011 Aug 26;1218(34):5757-64. doi: 10.1016/j.chroma.2011.06.099. 
      Epub 2011 Jul 3.