吡虫啉在枸杞中的残留动态

Residues Dynamics of Imidacloprid in Lycium

为了评价吡虫啉在枸杞上使用后的残留动态,在宁夏、内蒙古和甘肃同时进行残留动态试验。结果表明,吡虫啉在枸杞中的残留消解完全符合一级反应动力学方程式,在枸杞鲜果上的半衰期为3.0～3.4d,在枸杞干果上的半衰期为2.9～5.0d;按推荐剂量施用的情况下,在枸杞中的残留为0.004 2～0.403mg/kg。吡虫啉在枸杞中最高残留限量(MRL值)推荐值为1mg/kg。

To evaluate residues dynamics of imidacloprid in lycium,field trials for imidacloprid residue in lycium were conducted in Ningxia,Neimenggu and Gansu.The results showed that the residues and degradation dynamics of imidacloprid in lycium completely fitted to the first-order reaction kinetic equation.The half-life of degradation for imidacloprid was 3.0 to 3.4 d in fresh lycium berries,2.9 to 5.0 d in dry fruits.According to the recommended application dosage,the final residue ranged from 0.004 2 to 0.403 mg/kg of imidacloprid in lycium.The maximum residue limit was recommended 1 mg/kg in lycium.