Dissipation Patterns of Insecticide Sulfoxaflor in Spinach and Korean Cabbage

다국어 초록 (Multilingual Abstract)

The present greenhouse experiment was carried out to study the residues of sulfoxaflor in spinach and Korean cabbage under different pre-harvest application regimes. After 2 times application of with 1 week interval in that day of harvest (0), 3, 7, 14 and 21 days before harvest, and the residue of pesticides was investigated by LC-MS/MS. Matrix-matched calibration curves for sulfoxaflor in both spinach and Korean cabbage yielded good linearity (R<SUP>2</SUP> ≥ 0.9995). The biological half-lives of sulfoxaflor in spinach and Korean cabbage deduced from first order forms of decline (C=3.2539e<SUP>-0.179t</SUP> in spinach and C=1.2432e<SUP>-0.196t</SUP> in Korean cabbage) were 3.87 and 3.54 days, respectively. Pre-harvest residues of sulfoxaflor in spinach at 10-3 days (2.16 mg/kg) and 7-0 days (2.97 mg/kg) were above the EU-MRL (2.0 mg/kg), but within the MFDS value of 3.0 mg/kg. In Korean cabbage, residues at 10-3 days (0.74 mg/kg) and 7-0 days (1.17 mg/kg) were above the MFDS value of 0.3 mg/kg, though below the EU-MRL (6.0 mg/kg). Based on field incurred residues, it’s safe to apply sulfoxaflor to spinach as per MFDS regulation and Korean cabbage at 21-14 or 14-7 days before harvest as per EU regulation.

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