冻融作用对土壤镉动力学吸附解吸的影响  

Effect of the freezing-thawing on kinetics of adsorption-desorption of the soil cadmium

作　　者：王展[1] 张良[2] 党秀丽[1] 张玉龙[1] 

机构地区：[1]沈阳农业大学土地与环境学院,沈阳110866 [2]沈阳农业大学生物科学技术学院,沈阳110866

出　　处：《环境科学学报》2012年第3期721-725,共5页Acta Scientiae Circumstantiae

基　　金：国家重点基础研究发展(973)计划(No.2004CB418504);辽宁省博士启动基金(No.20101094)~~

摘　　要：为了研究冻融作用对土壤镉吸附解吸过程的影响,采用人工控温、室内培养方法对土壤进行冻融处理,并通过土壤镉动力学吸附解吸试验,分析了土壤对镉的吸附解吸量、吸附解吸率及吸附解吸速率.结果表明,冻融作用能够促进土壤对外源镉的吸附,镉的吸附量、吸附率和吸附速率均随着冻融次数的增加而增加.同时,冻融作用能减缓土壤对镉的解吸,随着冻融次数的增加,土壤对镉的解吸速率和解吸率降低,土壤镉解吸速率的下降率随冻融次数的增加而增大.In order to investigate the effect of freezing-thawing on the adsorption-desorption of cadmium, kinetics adsorption isotherms of soil contained with cadmium and the quantity, ratio and speed of adsorption-desorption under freezing-thawing conditions were carried out. The results showed that freezingthawing promoted cadmium adsorption of the soil. The quantity, ratio and speed of cadmium adsorption increased with the increase of freezing-thawing frequency. Freezing-thawing retarded soil cadmium desorption. With the increasing freezing-thawing cycles, the speed and ratio of soil cadmium desorption decreased and the decrement of the soil cadmium desorption speed increased.

关 键 词：土壤 镉 冻融作用 吸附解吸 动力学 

分 类 号：X53[环境科学与工程—环境工程]