安徽农业科学2012，Vol.40Issue(14)：8139-8142,4.
紫色水稻土对镉吸附解吸特性的研究
Adsorption and Desorption Characteristics of Cadmium in Three Purplish Paddy Soils
摘要
Abstract
[ Objective ] The research aimed to study the characteristics of cadmium adsorption and desorption in purplish paddy soil, providing scientific evidence for clarifying environmental fate of cadimium in purplish paddy soil. [ Method]The hatch method was used lo study the characteristics of cadmium adsorption and desorption in three purplish paddy soils including an acidic purplish paddy soil (APPS), a neutral purplish paddy soil(NPPS) and a calcareous purplish paddy soil (CPPS). Lanpnuir equal ion and Freundlich equation were used to describe the adsorption data and the relationship between adsorption ability and basic properties of the tested soils were examined. [ Result ]The adsorption of cadmium in three paddy soils increasd wilh the increase of initial concentrations of cadmium in solution, with the highest adsorption ability being observed in CPPS. The amount of cadmium adsorbed by NPPS was slightly higher than thai of APPS. The adsorption data of the soils could be well described with Langmuir equation and Freundlich equation. The desorption of cadmium from those soils increaseed with the increase of cadmium adsorbed by soils. Among them,the desorption rate of cadmium by CPPS was the lowest and the percentages of cadmium desorbed from APPS and NPPS were higher than 50%. There was close relationship between adsorption ability and basic properties of the tested soils and soil pH played an important role. No obvious relationship was found between the ability of cadmium adsorption and the content of amorphous iron and manganese oxide or clay. [Conclusion]CPPS had the strongest ability to fix cadmium, thus bad greater buffer capacity to the exogenous input cadmium. And there was high environmental risk as exogenous cadmium was input into APPS and NPPS. Soil pH played an important role in controlling the behavior of cadmium adsorption and deaorption in wits.关键词
镉/紫色水稻土/吸附/解吸Key words
Cadmium/Purplish paddy soilB/Adsorption/Desorption分类
农业科技引用本文复制引用
杜斌,赵秀兰..紫色水稻土对镉吸附解吸特性的研究[J].安徽农业科学,2012,40(14):8139-8142,4.基金项目
中央高校基本科研业务费专项资金(XDJK2009B027) （XDJK2009B027）
西南大学生态学重点学科“211工程”建设项目. （）
