فهرست نشریات علمی دسترسی آزاد ایران

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).