Zeolite Socony Mobil-5 ordered mesoporous carbon as a fiber coating for solid-phase microextraction

Abstract

In this study, an ordered mesoporous carbon (OMC) with a large surface area, uniform mesoporous structure and large pore volume was synthesized by using Zeolite Socony Mobil-5 (ZSM-5) as the hard template and sucrose as the carbon precursor. The synthesized OMC-ZSM-5 was immobilized onto a stainless steel wire for the preparation of SPME fibers by a sol–gel coating method. The SPME of polycyclic aromatic hydrocarbons (PAHs) with the OMC-ZSM-5 coated fiber coupled with gas chromatography/flame ionization detection (GC/FID) provided large enhancement factors (738–2359), low limits of detection (LODs, 0.5–1.6 ng g⁻¹) and good linearities (1.7–100.0 ng g⁻¹) for soil samples. The relative standard deviations (RSDs) for single fiber and fiber-to-fiber reproducibilities were in the range of 4.6–7.9% and 6.1–10.2%, respectively. The developed method was successfully applied to the analysis of soil samples and the recoveries of the analytes for the method were in the range from 88.0% to 103.8%. The OMC-ZSM-5 coated fiber was stable enough for 160 extractions without a significant loss of extraction efficiency.