乙草胺和丁草胺在土壤中的紫外光化学降解

采用实验室模拟实验研究了水分、pH值和表面活性剂对乙草胺和丁草胺在土壤中的紫外光降解行为的影响。结果表明，在湿度80％的土壤中，丁草胺和乙草胺的光解深度及光解速率均大于无水条件。随土壤pH值的增大，丁草胺在土壤中的光降解速率加快和光解深度加深。低浓度的阴 离子表面活性剂十二烷基苯磺酸钠（DDBS）促进丁草胺在土壤中的光解，使丁草胺在土壤中的光解深度增加。高浓度的DDBS对丁草胺在土壤中的光解有阻碍作用。阳离子表面活性剂十六烷基三甲基溴化铵（HDTMA）对丁草胺在土壤中的光解也有阻碍作用。

PHOTODEGRADATION OF ACETOCHLOR AND BUTACHLOR IN SOIL

In this paper,influence of water content,pH and surfacant on UV photolysis of acetochlor and butachlor in the soil was studied by laboratory simulation experiment.The result showed that the photodegradation rate and depth of butachlor and acetochlor was greater in the 80% humidity soil than in the anhydrous soil.As pH of the soil became greater,the photodegradation rate was faster and the photodegradation depth was greater.Anion surfactant dodecylbenzene sulfonic acid sodium at low concentration could promote butachlor to photodegradate in soil,cation surfactant hexadecyltrimethyl-ammonium could impede butachlor to photodegradate.