林丹在作物和土壤中的残留及其消解

通过不同施药方法,探讨了林丹在小麦、玉米中的残留水平。结果表明,林丹在作物中的残留量随施药量的增加而递增。采用喷雾,4(a.i.)g/亩,林丹在小麦中的残留为0.0073ppm;土壤处理,100(a.i.)g/亩,林丹在小麦中的残留为0.0134ppm;撒颗粒剂,0.015(a.i.)g/株,林丹在玉米中的残留为0.0600ppm.林丹在土壤中消解很快,当土壤处理[200(a.i.)g/亩],林丹在土壤中的半衰期为23.7～25.2d,消解99％需160d左右。作者认为,在我国部分害虫防治中起用林丹不可能对生态环境构成威胁。 

Residue and Degradation of Lindane in Crop and Soil

The levels of lindane residue in wheat and corn were studied by various application techniques in this paper.The results showed that the rate of application was found to be a more important factor in determining the residue levels. According to the recommended application rates at 4 (a.i.) g/mu for adult stage spraying (15% EC), lindane was found at an average of 0.0073 (range of 0.0062-0.0084) ppm in wheat; at 100(a.i.)g/mu for soil surface treatment (6% Dust),lindane was found at an average of 0.0134 (range of 0.0101-0.0201) ppm in wheat, and at 0.015 (a.i.) g/plant (1% Granule) , lindane was found at an average of 0.0431 (range of 0.0296-0.0516) ppm in corn. At the extremely high rate of 200 (a.i.) g/mu for soil treatment the initial half-time of lindane was 23.7 days in Heibei province, and 25.2 days in Henan province, and there was a 99% loss within 160 days. Therefore, it can not cause a threat on ecological environment to use lindane in partial control of crop insect pest in China.