title: Application of sol-gel based octyl-functionalized mesoporous materials coated fiber for solid-phase microextraction.
abstract: Octyl-functionalizd mesoporous SBA-15 was first used as precursor and selective stationary phase to prepare solid-phase microextraction (SPME) fiber by using the sol-gel technique. The new SPME coating possessed honeycomb-like porous structure and rough surface and showed excellent chemical stability and longer life span (over 200 cycles of usage). The performance of the octyl-SBA-15-coated fiber was tested through extraction of eight polycyclic aromatic hydrocarbons (PAHs). The results showed that the home-made SPME fiber exhibited higher extraction efficiency compared with the commercial SPME (30 μm and 100 μm PDMS) fibers. For PAHs analysis, the new fiber showed good precision (<4.8%), low detection limits (0.024-0.050 μg/L), and wide linearity (0.1-200 μg/L) under the optimized conditions. The repeatability of fiber-to-fiber and batch-to-batch was 3.2-8.4% and 4.4-9.5%, respectively. The method was applied to simultaneous analysis of eight PAHs with satisfactory recoveries in different spiking levels, which were 85.7-103.4% (10 μg/L) and 87.0-107.2% (50 μg/L) for water samples and 76.2-89.0% (10 μg/g) and 75.6%-91.2% (50 μg/g) for soil samples, respectively.
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China. wxm98@163.com
authors.forename: Xuemei
authors.initials: X
authors.lastname: Wang
authors.forename: Honghong
authors.initials: H
authors.lastname: Rao
authors.forename: Xiaoquan
authors.initials: X
authors.lastname: Lu
authors.forename: Xinzhen
authors.initials: X
authors.lastname: Du