苯氧威在甘蓝和土壤中的残留消解动态

Residue Dynamics of Fenoxycarb in Wild Cabbge and Soil

为了评价苯氧威在甘蓝和土壤中的安全性,指导其在甘蓝上规范使用,2014年在山东烟台、江苏南京、天津等地进行了苯氧威在甘蓝、土壤中的残留消解动态试验和最终残留量试验。结果表明:苯氧威在甘蓝和土壤中的残留消解均符合一级动力学方程,半衰期分别为1.6~1.9d和1.9~2.3d;苯氧威有效成分剂量为90g·hm^(-2),分别分2次和3次喷施,最后一次施药后3、7、14、21d的甘蓝和土壤中均未检出苯氧威(<0.02mg·kg^(-1)),因此建议苯氧威在甘蓝上施用的安全间隔期为3d。

In order to evaluate environmental safety of fenoxycarb in wild cabbage and soil,and to guide the standard usage of fenoxycarb in wild cabbage,experiments on the dissipation and final residue of fenoxycarb were carried out in Yantai of Shandong Province,Nanjing of Jiangsu Province and Tianjin Municipality during 2014.The results showed that the degradation dynamics of fenoxycarb were accord with the firstgrade dynamic equations in wild cabbage and soil.Their half-lives were 1.6-1.9 days and 1.9-2.3 days,respectively.When fenoxycarb of 90 g·hm^（-2） were sprayed 2 and 3 times,the wild cabbage harvested at the 3^（th）,7^（th）,14^（th）,21^（th） day after the last application,the final residues of fenoxycarb were not detected（fenoxycarb content 〈0.02 mg·kg^（-1））.