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J Chromatogr A. 2013 Dec 13;1320:27-32. doi: 10.1016/j.chroma.2013.10.065. Epub 2013 Oct 26.

Monolithic graphene fibers for solid-phase microextraction.

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  • 1Key Laboratory of Cluster Science, Ministry of Education of China, and School of Chemistry, Beijing Institute of Technology, Beijing 100081, PR China.

Abstract

Monolithic graphene fibers for solid-phase microextraction (SPME) were fabricated through a dimensionally confined hydrothermal strategy and their extraction performance was evaluated. For the fiber fabrication, a glass pipeline was innovatively used as a hydrothermal reactor instead of a Teflon-lined autoclave. Compared with conventional methods for SPME fibers, the proposed strategy can fabricate a uniform graphene fiber as long as several meters or more at a time. Coupled to capillary gas chromatography (GC), the monolithic graphene fibers in a direct-immersion (DI) mode achieved higher extraction efficiencies for aromatics than those for n-alkanes, especially for polycyclic aromatic hydrocarbons (PAHs), thanks to π-π stacking interaction and hydrophobic effect. Additionally, the fibers exhibited excellent durability and can be repetitively used more than 160 times without significant loss of extraction performance. As a result, an optimum extraction condition of 40°C for 50min with 20% NaCl (w/w) was finally used for SPME of PAHs in aqueous samples. For the determination of PAHs in water samples, the proposed DI-SPME-GC method exhibited linear range of 0.05-200μg/L, limits of detection (LOD) of 4.0-50ng/L, relative standard deviation (RSD) less than 9.4% and 12.1% for one fiber and different fibers, respectively, and recoveries of 78.9-115.9%. The proposed method can be used for analysis of PAHs in environmental water samples.

Copyright © 2013 Elsevier B.V. All rights reserved.

KEYWORDS:

Capillary gas chromatography; Monolithic graphene fiber; Polycyclic aromatic hydrocarbons; Solid-phase microextraction

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