螺螨酯在枸杞果实中的消解动态研究

Dissipation dynamics of spirodiclofen in wolfberry fruit

研究螺螨酯在枸杞鲜果、干果中的消解动态,为其在生产中的安全使用提供依据。参照《农药残留试验准则》进行螺螨酯消解动态试验,采用乙腈超声提取,高效液相色谱法进行残留检测分析。结果显示,24%螺螨酯悬浮剂在枸杞鲜果中的半衰期为6.9~11.2 d,在枸杞干果中的半衰期为8.5~10.4 d,属于易消解农药。参照欧盟制定的螺螨酯在枸杞中的最高残留限量(0.5 mg·kg^(-1)),建议推荐剂量(60 mg·kg^(-1),54 g·hm^(-2),4 000倍)1次施药的条件下,鲜用枸杞的安全间隔期为5 d以上,制干枸杞的安全间隔期为21 d以上。

The dissipation of spirodiclofen in fresh fruit and dry fruit of wolfberry was detected in this study to provide a reference for its safe application. According to Pesticide Residue Test Criteria of China,the open-field experiment was conducted in Zhongning courty of Ningxia province,and the dissipation of spirodiclofen was studied by acetonitrile extraction and HPLC-MS / MS detection. The results showed that the half-lives of spirodiclofen in fresh wolfberry fruit and dry wolfberry fruit were 6. 9-11. 2 days and 8. 5-10. 4 days,respectively. Spirodiclofen belongs to the easily degradable pesticide type. According to the maximum residue limits（ 0. 5 mg·kg^（-1）） of spirodiclofen of EU for wolfberry,after recommended dosage being sprayed for once,fresh wolfberry fruit was safe to eat after 5 days,and dry wolfberry fruit was safe to eat after 21 days.