除草剂毒草胺在土壤中的吸附和淋溶特性

Adsorption and leaching behavior of herbicide propachlor in soils

为研究毒草胺在土壤中的迁移特性,分别利用振荡平衡法和土柱淋溶法测定了毒草胺在不同土壤中的吸附和淋溶特性,并讨论了其影响因素.结果表明,毒草胺在3种供试土壤上的吸附特性能较好地用Freundlich吸附等温线拟合,吸附常数Kd为0.34—2.96 mg1-.nL.nkg-1,很难被土壤吸附,吸附与土壤有机质含量呈显著正相关.毒草胺在土壤中具有较强的淋溶性,淋溶速率:江西红壤>太湖水稻土>东北黑土,淋溶性强弱与毒草胺在土壤中的吸附性以及土壤粒径分布有关.

The adsorption and the leaching of a herbicide propachlor in three soils from China were examined using batch equilibrium method and column leaching method in order to understand the attenuation of this chemical in environment. Propachlor was difficult to be adsorbed by soil （Ka values ranged from 0.34 to 2.96 mgI -n. Ln. kg-1 ）, and its adsorption could finally be denoted by linear isotherm. Adsorption of propachlor was primarily related to the soil organic matter content. Propachlor was easy to be leached into low surface soil and brought some risks to groundwater, and the order of leaching rate of three soils was red soils of Jiangxi red soil 〉 Taihu Lake paddy soil 〉 black soils of Northeast.