Application of magnetic iron (III) oxinate nanocomposite as an efficient sorbent in magnetic dispersive solid phase extraction of pesticides

In this study, a magnetic iron (III) oxinate nanocomposite with high adsorption capacity and saturation magnetization was synthesized through coprecipitation in a short time and used as a sorbent in magnetic dispersive solid phase extraction of some pesticides from fruit juice and fruit samples. This step was followed by a dispersive liquid-liquid microextraction method to more enrichment of the analytes before their quantification by gas chromatography equipped with a flame ionization detector. To verify the successful synthesis of the sorbent, it was characterized using techniques including X-ray diffraction, Fourier transform infrared spectrophotometery, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometry. According to the method validation experiments, the proposed method provided low limits of detection (0.23-0.57 mu g L-1) and quantification (0.79-1.74 mu g L-1). The repeatability of the suggested approach, expressed as relative standard deviations, were equal to or less than 7.11% (at the concentrations of 25 and 50 mu g L-1 of each analyte). The enrichment factors and extraction recoveries for the pesticides ranged from 217 to 449 and 43.1-89.1%, respectively. Finally, the efficiency of the proposed extraction procedure was verified by its applying on various fruit juice and fruit samples.