Residual Characteristics and Dietary Risk Assessment of Fluopyram, Isofetamid and Acequinocyl in Lactuca sativa L.; [상추 중 Fluopyram, Isofetamid 및 Acequinocyl의 잔류특성 및 위해성 평가]

초록

This study evaluated the residual characteristics and dietary risks of three pesticides—fluopyram, isofetamid, and acequinocyl—applied to lettuce. Each pesticide was applied under identical greenhouse conditions, and lettuce samples were collected at 0, 1, 3, 5, and 7 days after application. LC–MS/MS analysis revealed biological half-lives of 5.29, 4.38, and 4.15 days for fluopyram, isofetamid, and acequinocyl, respectively. Fluopyram exhibited the longest persistence due to its high chemical stability, whereas isofetamid showed a shorter residue persistence owing to rapid formation of its metabolite GPTC. Acequinocyl dissipated faster because of its susceptibility to photodegradation. Based on the percentage of the acceptable daily intake (%ADI), fluopyram showed a dietary risk level of 155.2% on day 0, but the value decreased below 100% after 3 days. Isofetamid (47.6%) remained below the safety threshold, and acequinocyl showed less than 10% from day 1, indicating negligible risk. Three days after the final application, the risk from all pesticides was low, and consumer exposure was within a safely manageable level. ⓒ The Korean Society of Environmental Agriculture 2025.

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