ريزاستخراج مايع- مايع پخشي تركيب شده با اسپكترومتر تحرك يوني براي اندازه گيري آفت كش فن‌پيروكسي‌ميت در نمونه هاي آبي

In this study, a dispersive liquid–liquid microextraction method coupled with positive-mode corona discharge ion mobility spectrometry was developed for the preconcentration an‎d determination of trace levels of the acaricide fenpyroximate. For this purpose, 1,2-dichloroethane was selec‎ted as the extraction solvent an‎d methanol as the disperser solvent. To achieve maximum extraction efficiency, the parameters affecting the dispersive liquid–liquid microextraction process, including the type an‎d volume of solvents, centrifugation speed an‎d time, an‎d sample pH, were systematically investigated an‎d optimized. The developed method was validated based on extraction-assisted calibration curves in terms of linearity, limit of detection, limit of quantification, precision, an‎d enrichment factor. Under the optimized conditions for aqueous stan‎dard solutions, the method provided a linear range of 20-700 µg L⁻¹, a detection limit of 10 µg L⁻¹, an‎d an enrichment factor of approximately 340. eva‎luation of method repeatability at concentrations of 300 an‎d 500 µg L⁻¹ showed intra-day relative stan‎dard deviations of 4% for both concentration levels, while inter-day stan‎dard deviations were 9% an‎d 8% for 300 an‎d 500 µg L⁻¹, respectively. Finally, the efficiency an‎d reliability of the proposed method were assessed for the determination of fenpyroximate in real samples, including tap water, well water, an‎d diluted apple juice. In these matrices, linear ranges of approximately 30-400 µg L⁻¹, detection limits of 20-30 µg L⁻¹, an‎d relative recoveries ranging from 71% to 99% were obtained. Overall, the results demonstrate that dispersive liquid–liquid microextraction coupled with positive corona discharge ion mobility spectrometry, owing to its low solvent consumption, short analysis time, an‎d satisfactory repeatability, is an efficient method for the relatively rapid detection an‎d quantification of fenpyroximate in drinking water an‎d apple juice at microgram-per-liter concentration levels an‎d near regulatory limits. Furthermore, the proposed approach provides a suitable platform for the future development of similar analytical methods.

محمد تقي جعفري

محمد سراجي , نفيسه فهيمي كاشاني