Preparation and evaluation of graphene-coated solid-phase microextraction fiber |
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Authors: | Jinmei Chen Jingbin Zeng Jiaojiao Ji Jaeho Ha |
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Institution: | a Department of Chemistry and the Key Laboratory of Analytical Sciences of the Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China b State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China c Food Analysis Center, Korea Food Research Institute, San 46-1, Baekhyun, Bundang, Seongnam, Gyonggi Province 463-746, Republic of Korea |
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Abstract: | In this paper, a novel graphene (G) based solid-phase microextraction (SPME) fiber was firstly prepared by immobilizing the synthesized G on stainless steel wire as coating. The new fiber possessed a homogeneous, porous and wrinkled surface and showed excellent thermal (over 330 °C), chemical and mechanical stability, and long lifespan (over 250 extractions). The SPME performance of the G-coated fiber was evaluated in detail through extraction of six pyrethroid pesticides. Although the thickness of G-coated fiber was only 6-8 μm, its extraction efficiencies were higher than those of two commercial fibers (PDMS, 100 μm; PDMS/DVB, 65 μm). This high extraction efficiency may be mainly attributed to huge delocalized π-electron system of G, which shows strong π-stacking interaction with pyrethroid pesticide. The G-coated fiber was applied in the gas chromatographic determination of six pyrethroids, and their limits of detection were found to be ranged from 3.69 to 69.4 ng L−1. The reproducibility for each single fiber was evaluated and the relative standard deviations (RSDs) were calculated to be in the range from 1.9% to 6.5%. The repeatability of fiber-to-fiber and batch-to-batch was 4.3-9.2% and 4.1-9.9%. The method developed was successfully applied to three pond water samples, and the recoveries were 83-110% at a spiking of 1 μg L−1. |
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Keywords: | Graphene Solid-phase microextraction Pyrethroid pesticide π-Stacking interaction |
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