Evaluation of Residual Patterns of Fenoxanil and Thifluzamide in Rice Field
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In this study, residual patterns of fenoxanil and thifluzamide in different parts of rice plants were evaluated to assess harvest safety. Following foliar application, samples collected at 0, 1, 3, 5, 7 and 14 days after the treatment were separated into grain, leaf, stem, and root parts and analyzed using the QuEChERS method-based LC/MS/MS. The developed analytical method was validated to meet the guidelines of the European Commission (SANTE/11312/2021). On final sampling time points, residues in grain, leaf and stem declined by 83.7%, 88.5% and 69.9% for fenoxanil and 82.6%, 81.7% and 70.6% for thifluzamide, respectively. Conversely, root residues increased from 0.01 to 0.48 mg/kg for fenoxanil and 0.03 to 0.14 mg/kg for thifluzamide. The dissipation behaviors in grain, leaf, and stem samples indicated half-lives of 4.9, 4.2 and 8.1 days for fenoxanil and 5.4, 5.2 and 8.5 days for thifluzamide, respectively. The accumulation of residues in the roots was suggested by the reabsorption of residues remaining in the leaves into the soil after rainwater washing. All residue levels remained below the Maximum Residue Limits, confirming the safety of the harvested rice. These findings may provide a useful basis for understanding pesticide dynamics in rice and predicting future residues under field conditions.
Abstract
In this study, residual patterns of fenoxanil and thifluzamide in different parts of rice plants were evaluated to assess harvest safety. Following foliar application, samples collected at 0, 1, 3, 5, 7 and 14 days after the treatment were separated into grain, leaf, stem, and root parts and analyzed using the QuEChERS method-based LC/MS/MS. The developed analytical method was validated to meet the guidelines of the European Commission (SANTE/11312/2021). On final sampling time points, residues in grain, leaf and stem declined by 83.7%, 88.5% and 69.9% for fenoxanil and 82.6%, 81.7% and 70.6% for thifluzamide, respectively. Conversely, root residues increased from 0.01 to 0.48 mg/kg for fenoxanil and 0.03 to 0.14 mg/kg for thifluzamide. The dissipation behaviors in grain, leaf, and stem samples indicated half-lives of 4.9, 4.2 and 8.1 days for fenoxanil and 5.4, 5.2 and 8.5 days for thifluzamide, respectively. The accumulation of residues in the roots was suggested by the reabsorption of residues remaining in the leaves into the soil after rainwater washing. All residue levels remained below the Maximum Residue Limits, confirming the safety of the harvested rice. These findings may provide a useful basis for understanding pesticide dynamics in rice and predicting future residues under field conditions.