矿区偏碱性棕壤重金属镉污染修复研究  

Study on remediation of heavy metal cadmium pollution in alkaline brown soil in mining area

作　　者：罗红洁 强毅[1] 郝健松 LUO Hongjie;QIANG Yi;HAO Jiansong(Faculty of Land Resource Engineering,Kunming University of Science and Technology Kunming 650032;不详)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650032 [2]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《工业安全与环保》2022年第6期71-74,共4页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(41867031)。

摘　　要：通过田间原位试验研究腐殖酸和过磷酸钙在偏碱性棕壤中的重金属镉污染农田的修复效果,复合使用过磷酸钙和腐殖酸修复率最佳,总镉含量降低率为44.2%~57.46%,有效态镉含量降低率为42.23%~57.52%,腐殖酸能提高磷的有效性,提高磷对重金属镉的作用。过磷酸钙通过离子交换和沉淀等反应机制,使得重金属总镉以及有效态含量降低。腐殖酸自身大分子内多种活性官能团与重金属有多种不同形式的结合,进而影响重金属的形态或活性,增强土壤的吸附能力,同时腐殖酸与镉形成不溶性螯合物。Field in-situ experiments were conducted to study the remediation effect of humic acid and superphosphate on heavy metal cadmium polluted farmland in alkaline brown earth.The combined use of superphosphate and humic acid has the best remediation rate,and the total cadmium content reduction rate is 44.2%-57.46%,and the reduction rate of effective cadmium content is 42.23%-57.52%.Humic acid can increase the effectiveness of phosphorus and increase the effect of phosphorus on heavy metal cadmium.Superphosphate reduces the total cadmium and effective state content of heavy metals through reaction mechanisms such as ion exchange and precipitation.Humic acid has a variety of active functional groups in its own macromolecule that bind to heavy metals in many different forms,thereby affecting the form or activity of heavy metals and enhancing the adsorption capacity of soil.At the same time,humic acid forms an insoluble chelate with cadmium.

关 键 词：污染修复 腐殖酸 过磷酸钙 重金属镉 有效态镉 

分 类 号：X53[环境科学与工程—环境工程]