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New polypyrrole–carbon nanotubes–silicon dioxide solid‐phase microextraction fiber for the preconcentration and determination of benzene, toluene, ethylbenzene, and o ‐xylene using gas liquid chromatography
Author(s) -
SarafrazYazdi Ali,
Rounaghi Gholamhossein,
Razavipanah Iman,
Vatani Hossein,
Amiri Amirhassan
Publication year - 2014
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201400178
Subject(s) - ethylbenzene , toluene , benzene , solid phase microextraction , gas chromatography , chemistry , chromatography , xylene , polypyrrole , carbon nanotube , materials science , organic chemistry , gas chromatography–mass spectrometry , mass spectrometry , nanotechnology , polymer , polymerization
For the first time, a polypyrrole–carbon nanotubes–silicon dioxide composite film coated on a steel wire was prepared by an electrochemical method. Scanning electron microscopy images showed that this composite film was even and porous. The prepared fiber was used as an absorbent for the headspace solid‐phase microextraction of benzene, toluene, ethylbenzene, and o ‐xylene, followed by gas chromatographic analysis. This method presented an excellent performance, which was much better than that of a polypyrrole–carbon nanotube fiber. It was found that under the optimized conditions, the linear ranges were 0.01–200 ng/mL with correlation coefficients >0.9953, the detection limits were 0.005–0.020 ng/mL, the relative standard deviations were 3.9–6.4% for five successive measurements with a single fiber, and the reproducibility was 5.5–8.5% ( n = 3). Finally, the developed method was successfully applied to real water samples, and the relative recoveries obtained for the spiked water samples were from 91.0 to 106.7%.