丙硫克百威在几种土壤中的迁移和降解研究

STUDIES ON THE TRANSLOCATION AND DEGRADATION OF BENFURACARB IN DIFFERENT SOILS

对丙硫克百威在湖南几种土壤中的迁移和降解进行了研究。结果表明 :丙硫克百威在土壤中能被雨水淋溶迁移 ,在 2 0cm耕作土层中 ,丙硫克百威及其降解产物克百威要分布在 0～ 1 4cm范围内 ,丙硫克百威的使用 ,对地下水污染的可能性比较小。丙硫克百威在第四纪红土红壤、河潮土、河潮泥中半衰期分别为 6.3d、7.3d、8.8d。在施药 3 0d内 ,丙硫克百威在土壤中降解很快 ,化学降解作用要大于生物降解作用 ,其中部分降解产物为克百威、3 -羟基克百威 ,其中 3 -羟基克百威在丙硫克百威降解过程中产生甚微。克百威的继续降解随时间无明显的规律。

Summary The translocation and degradation of benfuracarb in different soils were studied. The leaching of benfuracarb in soils was described. The vertical distribution of benfuracarb and carbofuran, a metabolic product of benfuracarb, ranged from 0 to 14 cm in soil column. The benfuracarb and carbofuran in the soil column that was lower than 14 cm. Benfuracarb and carbofuran move to lower in soil column with more precipitations. Results indicated that there was little possibility of comtaminating the underground water. Results showed that the half life of benfuracarb was 6.3～8.8 d in three different soils. There were some differnces with different soils. Degradation of benfuracarb was not much more slowly under sterilization condition than that under normal condition. When soils were treated with sterilization, the half life of benfuracarb is 6.8～10.4 d in three soils. The result suggested that chemdegradation had a greater effect than biodegradation. Within 30 d, benfuracarb was degradated fast and produced carbofuran and 3 hyd roxycarbofuran. Carbofuarn are subsequenly degradated irregularly. 3 hydroxycarbofuran produced in the process was little. The method based on gas chromatography and NP detector was applied in this study.