阿特拉津、镉在表层沉积物（生物膜）上的干扰吸附特性

Interference adsorption properties of atrazin and cadmium on surface sediments （surface coatings）

目的研究镉和阿特拉津共存体系中二者在表层沉积物（生物膜）上的干扰吸附特性。方法采用选择性萃取方法分离表层沉积物（生物膜）中各活性组分（铁氧化物、锰氧化物、有机质），利用Langmuir等温吸附曲线研究表层沉积物（生物膜）对阿特拉津的吸附特性及各组分对阿特拉津的吸附贡献。结果镉的存在对阿特拉津的吸附有一定的促进作用，但当镉的浓度达到8mg／L时，对阿特拉津的吸附产生抑制作用；生物膜及各组分对阿特拉津的吸附能力高于表层沉积物；表层沉积物（生物膜）非残渣态组分对阿特拉津的吸附能力均大于残渣态组分，且非残渣态中铁氧化物的单位吸附能力最强，其次是有机质。结论镉的存在能够影响表层沉积物（生物膜）对阿持拉津的吸附。

Objective Interference adsorption properties of atrazine and cadmium on surface sediments （surface coatings） in their coexisting system was studied. Method Selective extraction method was adopted to separate different active ingredients （Iron Oxides, Manganese Oxides, and Organic matter） in surface sediments （surface coatings）. Langmuir adsorption isotherms was introduced to study the adsorption properties of atrazine on surface sediments （surface coatings）, as well as adsorption capacity of different active ingredients on atrazine. Result Cadmium could accelerate atrazine adsorption. However, when concentration of cadmium reached up to 8mg/L, inhibitory action for its adsorption occurred. It was found that surface coatings and theirs ingredients had higher adsorption capacity on atrazine than surface sediments. It was also shown that non-residue ingredients in surface sediments （surface coatings） had higher adsorption capacity on atrazine than residue ingredients, where iron oxides of non-residue ingredients had the best adsorption capacity, followed by organic matter. Conclusion Cadmium could influence atrazine adsorption on surface sediments （surface coatings）.