Application of sol–gel based octyl-functionalized mesoporous materials coated fiber for solid-phase microextraction

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.