• 关键词：土壤  镉  冻融作用  吸附解吸  动力学

• 基金项目：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)

• 王展
• 沈阳农业大学土地与环境学院,沈阳 110866

• 张良
• 沈阳农业大学生物科学技术学院,沈阳 110866

• 党秀丽
• 沈阳农业大学土地与环境学院,沈阳 110866

• 张玉龙
• 沈阳农业大学土地与环境学院,沈阳 110866

• 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.

• Abstract：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 freezing-thawing 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.

• Key words：soil  cadmium  freezing-thawing  adsorption-desorption  kinetics

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