Dissipation kinetics and dietary risk assessment of metrafenone in greenhouse-grown tomatoes and cucumbers using LC-MS/MS

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) repeatability below 16% for both matrices, confirming the method's repeatability. Matrix effects were minimal, with values of -6.71% and -4.15% for tomatoes and cucumbers, respectively, indicating negligible signal suppression. The dissipation followed first-order kinetics, with half-lives of 1.93-1.96 days and 1.61-1.67 days, respectively. The pre-harvest interval (PHI) was estimated at 1.18-1.56 days for tomatoes and 1.37-2.68 days for cucumbers. Terminal residues varied based on application rates and spray frequency, with some exceeding maximum residue limits (MRLs) at early intervals before declining to safe levels. Chronic dietary risk assessment confirmed that the chronic hazard quotient (HQc) values remained significantly below the safety threshold of 100%, indicating no significant health risks. These findings provide essential data for determining appropriate PHIs and ensuring food safety compliance in commercial crop production.

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