Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1444, Issue -, Pages 42-49Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2016.03.074
Keywords
Multiwalled carbon nanotubes; Ionic liquid polymer; Poly(3,4-ethylenedioxythiophene); Nafion; Solid-phase microextraction; Carbamate pesticides
Funding
- National Natural Science Foundation of China [21275112]
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A poly(3,4-ethylenedioxythiophene)-ionic liquid polymer functionalized multiwalled carbon nanotubes (PEDOT-PIL/MWCNTs) composite solid-phase microextraction (SPME) coating was fabricated by electrodeposition. After being dipped in Nafion solution, a Nafion-modified coating was obtained. The outer layer Nafion played a crucial role in enhancing the durability and stability of the coating, thus it was robust enough for replicated extraction for at least 150 times without decrease of extraction performance. The Nafion-modified coating exhibited much higher sensitivity than commercial coatings for the direct extraction of carbamate pesticides in aqueous solutions, due to its strong hydrophobic effect and pi-pi affinity based enrichment. When it was used for the determination of carbamate pesticides in combination with gas chromatography-flame ionization detection, good linearity (correlation coefficients higher than 0.9981), low limits of detection (15.2-27.2 ng/L) and satisfactory precision (relative standard deviation <8.2%, n=5) were achieved. The developed method was applied to the analysis of four carbamate pesticides in apple and lettuce samples, and acceptable recoveries (i.e. 87.5-106.5%) were obtained for the standard addition. (C) 2016 Elsevier B.V. All rights reserved.
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