题目：Comparison of the performance of conventional, temperature-controlled, and ultrasound-assisted ionic-liquid-dispersive, liquid-liquid microextraction combined with high-performance liquid chromatography in analyzing pyrethroid pesticides in honey samples
摘要：This research paper presents a comparative study of the performance of conventional, ultrasound-assisted (UA), and temperature-controlled (TC) ionic liquid (IL) dispersive liquid-phase microextraction (IL-DLLME). Various parameters that affect extraction efficiency, such as type and volume of extraction and disperser solvent, centrifugation time, salt addition, effect of temperature on TC-IL-DLLME, and effect of sonication time on UA-IL-DLLME, were evaluated. UA-IL-DLLME was found to provide the best extraction efficiency. Under optimized conditions, great enrichment factors (506−515) and good recoveries (101.2%−103.0%) were obtained by analyte extraction in real samples. The limit of detections (LODs) ranged from 0.21−0.38 μg/L. Good linearity was obtained in the range of 0.5−200 µg L-1 for ethofenprox and tetramethrin, and 1−200 µg L-1 for meperfluthrin and alpha-cypermethrin. Based on optimized conditions, the UA-IL-DLLME method was applied and combined with high-performance liquid chromatography with diode array detection (HPLC-DAD) to determine the presence of ethofenprox, tetramethrin, meperfluthrin, and alpha-cypermethrin in honey samples.
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