污灌条件下非离子表面活性剂对土壤中有机农药迁移的影响研究

摘要

采用振荡平衡法和淋洗法，研究了污灌条件下非离子表面活性剂Tween－80在表层土壤和深层土壤上的吸附行为及其对有机农药甲萘威迁移的影响。结果表明：在振荡平衡条件下，低Tween－80浓度的污水灌溉会促进甲萘威在表层土壤中的吸附，而高Tween－80浓度的污水灌溉会抑制甲萘威在深层土壤中的吸附；在淋洗条件下，Tween－80在深层土壤中表现出较强的吸附能力。%By using batch adsorption and leaching adsorption method, adsorption behaviors of nonionic surfactant Tween-80 in topsoil or deep soil were compared and their effect on migration of organic pesticide carbaryl in soil under sewage irrigation con-ditions were investigated.The results of the batch adsorption experiments showed that low Tween -80 concentration wastewater ir-rigation increased the adsorption of carbaryl in topsoil.On the contrary, high Tween-80 concentration wastewater irrigation re-duced the adsorption of carbaryl in deep soil and increased the migration of organic pesticide in deep soil.Under leaching adsorp-tion condition, the higher adsorption of nonionic surfactant Tween-80 in soil was observed.