【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 .更多还原

【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 understand combined effects of these 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.更多还原