• 关键词：毒死蜱  腐殖酸  吸附

• 基金项目：重庆市自然科学基金项目(No9125)

• 魏沙平
• 西南大学化学化工学院 重庆 400716

• 李红陵
• 西南大学化学化工学院 重庆 400716

• 陈飞霞
• 西南大学资源环境学院重庆市农业资源与环境研究重点实验室 重庆 400716

• 魏世强
• 西南大学资源环境学院重庆市农业资源与环境研究重点实验室 重庆 400716

• 摘要：采用平衡振荡法进行农药毒死蜱在5种土壤腐殖酸上的吸附试验.结果表明,毒死蜱在不同土壤腐殖酸上的吸附行为表现出一定的差异,并均可用Linear方程和Freundlich方程来描述;5种土壤腐殖酸对毒死蜱吸附能力都很强,吸附率均较高(平均值在72.57%～88.21%之间),大小顺序为:紫色潮土HA>黄壤HA>中性紫色土HA>酸性紫色土HA>腐殖土HA,此顺序与腐殖酸腐殖化程度一致;pH=2时,腐殖酸对毒死蜱的吸附能力显著增大;离子强度对毒死蜱的吸附影响不明显;腐殖酸添加量越大,单位质量的腐殖酸吸附量越小.

• Abstract：Sorption isotherms of the pesticide chlorpyrifos in humic acid(HA) isolated from 5 different kinds of soils were measured using a batch sorption method.The results showed the sorption isotherm of chlorpyrifos in HA fit both a linear equation and the Freundlich equation.The adsorption of chlorpyrifos by all HAs was strong,decreasing in the order neutral purple soil > yellow soil > purple alluvium> acid purple soil >humus soil.Sorption of chlorpyrifos by HA was influenced by many factors.The lower the pH,the larger the adsorptive capacity.However,ionic strength had a negligible effect.In addition,the sorption amount increased with the amount of added HA,but the sorption amount of unit HA decreased with the amount of added HA.

• Key words：chlorpyrifos  humic acid  sorption

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