湖南省典型红壤理化特性对土壤吸附铅及淋溶特性影响  

Influence of the physicochemical properties of typical red soils in Hunan Province on the sorption and leaching properties of lead from soils

作　　者：李旗强 田江 LI Qiqiang;TIAN Jiang(College of Environment and Resources,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学环境与资源学院,湖南湘潭411105

出　　处：《湘潭大学学报（自然科学版）》2023年第5期12-25,共14页Journal of Xiangtan University(Natural Science Edition)

基　　金：国家自然科学基金(42207041);湖南省科技厅青年基金(2019112500406)。

摘　　要：湖南省铅污染严重,但铅在湖南省典型红壤中的迁移转化机制,以及理化性质是如何影响铅的迁移转化机制尚不明晰.本研究以湖南典型红壤为研究对象,模拟铅污水淋溶条件下铅在红壤中的迁移转化机制.研究结果表明红壤对铅的吸附作用与铅在红壤中的纵向迁移速率呈现负相关,吸附铅的能力强弱依次是红壤>黄红壤>棕红壤>红壤性土壤.淋溶后4种红壤铅污染严重,铅主要以可交换态、铁锰氧化态和碳酸盐结合态存在,有机结合态、残渣态占比较少,分别为29.83%~40.16%、32.38%~40.76%、12.62%~22.14%、4.12%~9.83%、1.19%~2.50%,容重、pH、游离氧化铁和有机质含量会影响红壤对铅的吸附能力以及铅在红壤中的迁移转化过程.Lead pollution in Hunan Province is serious,but the migration and transformation mechanism of lead in typical red soil in Hunan Province,and how the physicochemical properties affect the migration and transformation mechanism of lead are still unclear.In this study,a typical red soil in Hunan was used as the research object to simulate the migration and transformation mechanism of lead in red soil under the leaching conditions of lead sewage.The results showed that the adsorption effect of lead in red soil was negatively correlated with the longitudinal migration rate of lead in red soil,and the adsorption capacity of lead was red soil>yellowish red soil>brown-red soil>red-loam soil.After leaching,the four red soil lead pollution is serious,lead mainly exists in exchangeable state,iron-manganese oxidation state and carbonate bound state,organic bound state and residual state account for less,accounting for 29.83%~40.16%,32.38%~40.76%,12.62%~22.14%,4.12%~9.83%,1.19%~2.50%,bulk density,pH,free iron oxide and organic matter content will affect the adsorption capacity of red soil to lead and the migration and transformation process of lead in red soil.

关 键 词：铅 红壤 吸附能力 迁移转化 重金属形态 

分 类 号：X53[环境科学与工程—环境工程]