期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1412, 期 -, 页码 1-11出版社
ELSEVIER
DOI: 10.1016/j.chroma.2015.07.087
关键词
Dispersive micro-solid phase extraction; Coextraction; Multiwalled carbon nanotubes/Fe3O4@polypyrrole; High performance liquid chromatography; Pollutants
The simultaneous extraction of acidic, basic and amphiprotic pollutants from various samples is a considerable and disputable concept in sample preparation strategies. In this study, for the first time, coextraction of acidic, basic and amphiprotic pollutants (polar and apolar) with multiwalled carbon nanotubes/Fe3O4@polypyrrole (MWCNT5/Fe3O4@PPy) composite based dispersive micro-solid phase extraction followed by high performance liquid chromatography-photo diode array detection was introduced. Firstly, the extraction efficiency of various magnetic nanosorbents including Fe3O4, MWCNTs/Fe3O4, graphene oxide/Fe3O4 (GO/Fe3O4), Fe3O4@PPy, MWCNT5/Fe3O4@PPy and GO/Fe3O4@PPy were compared. The results revealed that MWCNT5/Fe3O4@PPy nanocomposite has higher extraction efficiency for five selected model analytes (4-nitrophenol, 3-nitroaniline, 2,4-dichloroaniline, 3,4-dichloroaniline and 1-amino-2-naphthol). Box-Behnken design methodology combined with desirability function approach was applied to find out the optimal experimental conditions. The opted conditions were: pH of the sample, 8.2; sorbent amount, 12 mg; sorption time, 5.5 min; salt concentration, 14% w/w; type and volume of the eluent, 120 mu L acetonitrile; elution time; 2 min. Under the optimum conditions detection limits and linear dynamic ranges were achieved in the range of 0.1-0.25 mu g L-1 and 0.5-600 mu g L-1, respectively. The percent of extraction recovery and relative standard deviations (n = 5) were in the range of 45.6-82.2 and 4.0-8.5, respectively. Ultimately, the applicability of this method was successfully confirmed by analyzing rain, snow and river water samples and satisfactory results were obtained. (C) 2015 Elsevier B.V. All rights reserved.
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