In this study, a new solid phase micro extraction (SPME)
fiber coated by sol-gel technology based on polyethylene
glycol (PEG) grafted ionic liquids (ILs), and silica
nanoparticles (silica NPs) on a porous copper substrate
was fabricated. The as-prepared fiber (PEG-ILs-silica
NPs) was then used to extract a variety of pesticides in
tomato samples before prior to their gas chromatography
flame ionization detection (GC-FID). The key parameters
influencing extraction efficiency containing including
extraction time, stirring rate, extraction temperature, pH,
ionic strength, and desorption temperature, and time were
investigated and optimized. The relative standard
deviations (RSDs) for single fiber repeatability ranged
from 1.2 to 4.6% (n=6), and the RSDs for fiber-to-fiber
reproducibility (n=6) were 3.3–6.8%, respectively. The
proposed method based on the PEG-ILs-silica NPs fiber
was successfully applied for the determination of targeted
pesticides in tomato samples with good recoveries from
89.8 to 103.5% (RSDs=2.1-6.9). Manuscript profile