摘要
化学农药在土壤中的吸附和淋溶特性是评价其环境行为的重要指标,也是新农药登记必须提供的环境影响资料。本文分别采用振荡平衡法、土壤薄层层析法和土柱淋溶法研究了丁吡吗啉在不同土壤中的吸附和淋溶特性。结果表明,丁吡吗啉在3种供试土壤上的吸附规律可以较好地用FreundLich方程描述,吸附常数Kd在10.42~37.72mL.g-1之间,在砂土中较难被吸附,在壤土和粘土中属中等吸附。丁吡吗啉在3种供试土壤中不易移动或不移动,3种土柱淋溶试验的结论均为难淋溶。根据综合试验结果,对相关影响因素进行了讨论,认为影响丁吡吗啉在土壤中吸附性的主要因素为土壤有机质含量和土壤粘粒含量,影响淋溶特性的主要因素为土壤吸附和丁吡吗啉在水中的溶解度。
The adsorption and leaching of pesticides on and in soils are important evaluation index which can be used to describe the behavior and predict the potential risk of pesticides in environment.The data of the adsorption and leaching are necessary for the pesticide register.In this study,the adsorption and leaching of pyrimorph in different soils in China were conducted by oscillation equilibrium experiment,soil TLC and column leaching.The results showed that pyrimorph was rather difficult to be adsorbed on the sandy soil,the sorption on the loam soil and the clay soil were medium degree,with Kd values from 10.42~37.72 mL.g-1.The sorption isotherm could be well described by FreundLich equation.In all the kinds of experimental soil,pyrimorph showed comparatively low mobility and leaching degree.According to the results,the influencing factors were also discussed.The contents of soil organic matter and clay were considered as the key influencing factors for soil adsorption,and for leaching,the soil adsorption and the solubility of pyrimorph had the main effect.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2010年第11期2128-2132,共5页
Journal of Agro-Environment Science
基金
"十一五"科技支撑计划项目(2006BAE01A03-10)
关键词
丁吡吗啉
吸附
淋溶
pyrimorph
adsorption
leaching
