Journal
JOURNAL OF SEPARATION SCIENCE
Volume 39, Issue 17, Pages 3445-3456Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201600416
Keywords
Chemometrics; High performance liquid chromatography; Multiwalled carbon nanotubes; Sol-gel processes; Stir bar extraction
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Poly(ethylene glycol) grafted onto carboxyl-terminated multi-walled carbon nanotubes were prepared by the sol-gel technique as a stationary phase for stir bars. The analytical methodology included stir bar sorptive extraction with micellar desorption followed by liquid chromatography. Polycyclic aromatic hydrocarbons were used as the model compounds to evaluate the extraction performance. The extraction efficiency, for the determination of polycyclic aromatic hydrocarbons from water samples, was optimized based on a chemometrics approach. The effect of the experimental parameters on the extraction response was investigated and the optimum extraction conditions were selected. Under the optimum conditions, the proposed method showed a good linearity within the different ranges for different analytes (e.g. 0.05-500 ng/mL for phenanthrene), a square of the correlation coefficient was higher than 0.999, and an appropriate limit of detection in the range of 0.013-0.072 ng/mL. The recoveries in all cases were above 94%, with relative standard deviations below 2.4%.
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