不同粒级土壤团聚体对砷(V)的吸附与解吸影响研究  

Study on Effect of Different Size Fraction Soil Aggregate on Adsorption and Desorption of As(V)

作　　者：陈朕[1] 梁成华[1] 杜立宇[1] 郭冉[1] 

机构地区：[1]沈阳农业大学,辽宁沈阳100866

出　　处：《西南农业学报》2013年第3期1100-1104,共5页Southwest China Journal of Agricultural Sciences

基　　金：国家自然科学基金项目:长期定位施肥对设施蔬菜栽培土壤团聚体稳定性的影响研究(31171977)

摘　　要：本文以辽宁省朝阳市日光温室耕层土壤作为研究对象,探讨不同粒径团聚体对土壤中砷(As(V))吸附解吸的影响。结果表明,不同粒级团聚体对As(V)的吸附和解吸能力均符合Freundlich拟合方程,R2介于0.9528～0.9972之间,其中<53μm粒径团聚体对As(V)的吸附、解吸能力最强,并随着粒径的增大,吸附、解吸能力均降低,且不同粒径对As的吸附与解吸能力呈显著正相关关系。随着溶液中As(V)的浓度的提高,各粒径团聚体对As(V)的吸附、解吸能力均提高,K值介于17.75～50.51之间。不同粒级团聚体对As(V)的吸附量与土壤有机质含量、游离氧化铁含量及CEC含量之间均呈正相关关系,说明团聚体对As(V)的吸附受到土壤团粒胶结剂的影响。Taking the greenhouse soil in Chaoyang city of Liaoning province as the research object,the effects of different size fraction aggregate on the adsorption and desorption on As（V） in the soil were studied.The results showed that different size fraction aggregate had the adsorption and desorption ability on As（V）,and the ability was in accord with Freundlich fitting equation.R2 was from 0.9528 to 0.9972.Among them,the fraction aggregate of which size was less than 53 μm had the strongest adsorption and desorption ability on As（V）.With the size fraction increase,adsorption and desorption ability decreased.The adsorption and desorption ability of different size fraction on As had a significantly positive relationship.With the concentration of As（V） in the solution increase,the adsorption and desorption ability of every size fraction on As（V） increased.K-value was from 17.75 to 50.51.The adsorption capacity of different size fraction aggregate on As with soil organic matter content,free iron oxide content and CEC content all had a positive relationship.This showed that the adsorption of aggregate on As（V） was affected by soil aggregate agent.

关 键 词：团聚体 AS(V) 吸附与解吸 

分 类 号：S151.93[农业科学—土壤学]