摘要
对去除有机质前后汞（Ⅱ）在棕壤中吸附—解吸行为进行了分析。结果表明,有机质对棕壤汞的吸附贡献很大。去除有机质后,棕壤对汞（Ⅱ）的吸附率由95.62%~93.18%下降到62.8%~56.70%,解吸率则由2.39%~7.47%提高到2.65%~11.23%。Freundlich方程,Langmuir方程,Henry模型以及Temkin方程均能较好地描述去除有机质前后棕壤对汞的等温吸附过程。动力学方程拟合结果表明,棕壤去除有机质后,对汞（Ⅱ）的吸附—解吸速率均降低,其中Elovich方程和双常数方程拟合效果最优,均达到极显著相关关系（R〉0.708）。
The adsorption--desorption behavior of Hg（ Ⅱ ） in brown soil was studied to find the difference of the behavior with and without organic matter（OM）. The results showed that OM has a great influence on the adsorption--desorption of mercury in brown soil. Without OM, brown soil adsorption rate for Hg （Ⅱ） dropped from 95.62%~93.18~ to 62.8%~56.70%, desorption rate rose from 2.39%~7.47% to 2.65% ~11.23%. Freundlich equation, Langmuir equation, Henry model and Temkin equation can well describe the isothermal adsorption on mercury process in brown soil with and without OM. The matching result of dynamics equation showed, brown soil adsorption-desorption rate for Hg（ Ⅱ ） was reduced after OM was removed, elovich equation and double constant equation were optimum, it reached highly significant positive correlation（R〉0. 708）.
出处
《水土保持通报》
CSCD
北大核心
2014年第6期32-35,42,共5页
Bulletin of Soil and Water Conservation
基金
农业部"农产品产地土壤重金属污染治理修复示范"
关键词
有机质
棕壤
汞
吸附解吸
organic matter
brown soil
mercury
adsorption-desorption
