This study investigated dissipation patterns of pesticide residues in agricultural products during cultivation and suggested the pre-harvest residue limits (PHRLs) based on their dissipation patterns and biological half-lives. The pesticides were applied on agricultural products in two different regions at the recommended dose, respectively. The sample for dissipation pattern study were harvested at 0, 1, 2, 3, 5, 7 and 10 days after treatment, and analyzed by high-performance liquid chromatography or gas chromatography. The residue of samples was determined by analytical instruments after extraction, partition and purification with Florisil. For method validation, the limit of quantitation, standard calibration curve, linearity, repeatability, reproducibility, sensitivity and specificity were conducted. Recovery experiments were conducted to validate the analytical method. The established method satisfied criteria of the analytical method for pesticide residues, which covered 70~110% recovery range, less than 20% of relative standard derivations, and higher sensitivity than 0.05 mg/kg of limit of quantitation or half of maximum residue limits. The biological half-lives of pesticides in two different field studies were calculated. The PHRL of pesticides were recommended for 10 days before harvest, respectively.

Dissipation pattern of pesticide residues during cultivation of agricultural products for establishing post-harvest residue level in Korea

253rd National Meeting (2017)

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