研究论文
司友斌,岳永德,周东美,陈怀满.农药在光照土壤层的迁移和降解[J].环境科学学报,2003,23(1):119-123
农药在光照土壤层的迁移和降解
- The transport and degradation of pesticide on irradiated soil layers
- 基金项目:国家自然科学基金(29877001);中国科学院红壤生态开放实验站基金;安徽省高等学校青年教师科研资助计划资助项目
- 司友斌
- 安徽农业大学环境科技学院,合肥 230036
- 岳永德
- 安徽农业大学环境科技学院,合肥 230036
- 周东美
- 中国科学院南京土壤研究所,南京 210008
- 陈怀满
- 中国科学院南京土壤研究所,南京 210008
- 摘要:光照条件下, 农药在土壤层中的降解速率不仅决定于光解本身, 而且还是土层厚度、迁移过程的函数.为此, 描述了理解这些不同过程复合效果的理论框架, 提出了允许实际光解过程和扩散过程分离定量的实验方案, 同时进行了除草剂苄嘧磺隆在不同厚度土壤中的光解实验, 并用数学模型评价了实验结果.实验中确定了苄嘧磺隆在土壤中的实际光解速率常数, 这个常数是不依赖于迁移动力学的.
- Abstract:On irradiated soil layers, the observed overall pesticide degradation rate is not only determined by photodegradation itself but is also a function of the layer thickness and in many cases of transport processes. In this article we describe a theoretical frameworK different processes, and we present an experimental setup that allows a separate quantification of actual photodegradation and diffusive transport processes. For the compound bensulfuron methyl we performed experiments on soil layers of variable thickness and evaluated the results using a mathematical model. Thus, we were able to determine the actual photodegradation rate constants that are independed of transport kinetics.
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