Pesticide Toxicology Laboratory, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, 641 003, India.
Bull Environ Contam Toxicol. 2024 Sep 21;113(4):44. doi: 10.1007/s00128-024-03954-2.
A field experiment was conducted to study the persistence and reduction of quinalphos residues in cauliflower curd by applying quinalphos 25 EC twice at 250 g a.i./ha at 10 days intervals. The limit of quantification (LOQ) was 0.05 µg/g, recovery ranged from 97 to 113%, and the relative standard deviation was less than 7%. The initial deposition of quinalphos residues in cauliflower curd was 1.72 µg/g and reached below LOQ level after 15 days of application. Dissipation of the residue followed first-order kinetics with a half-life of 2.32 days. The reduction of quinalphos residue was evaluated using various household processes. The greatest reduction (82%) was observed when washing was followed by cooking or boiling, while the smallest reduction (55.8%) was found when washing alone was performed. A waiting period of 9 days is recommended for safe consumption of cauliflower based on the FSSAI MRL value of 0.1 µg/g.
采用 25%喹硫磷乳油 250 克/公顷，间隔 10 天施药 2 次，进行田间试验，研究了在花椰菜上施药 2 次后喹硫磷的残留消解动态和半衰期。定量限（LOQ）为 0.05μg/g，回收率为 97%~113%，相对标准偏差小于 7%。施药后 15 天，花椰菜中喹硫磷的初始沉积量为 1.72μg/g，降至低于 LOQ 水平。残留消解遵循一级动力学，半衰期为 2.32 天。采用各种家庭处理方法评估喹硫磷残留的减少情况。在单独清洗后，残留减少率最低（55.8%），而在清洗后再进行烹饪或煮沸时，残留减少率最高（82%）。根据 FSSAI 的 MRL 值 0.1μg/g，建议等待 9 天，以确保食用花椰菜的安全。
