作　　者： ; ; ;

机构地区： 北京大学城市与环境学院地表过程分析与模拟教育部重点实验室

出　　处： 《土壤》 2004年第2期211-214,共4页

摘　　要： 本文研究了贵州遵义红壤中pH对砷(As)的吸附和形态的影响.结果表明,当溶液中As的浓度增大时,土壤对As的吸附量增大,吸附率逐渐降低,As从红壤的低能位点位逐渐进入到高能位吸附点位,吸附反应速率减慢.Langmuir方程拟合等温吸附效果较好,可决系数达到0.969(P＜0.001).体系pH是影响红壤对As吸附、解吸的重要因素,As的吸附量随着体系pH的升高而降低,吸附态As的解吸量随着体系pH的升高而增大.酸性环境(pH=4-6.5)有利于As的吸附,碱性环境(pH=7-8.5)有利于As的解吸. Characteristics of Arsenic adsorption in red soil, in Zunyi, Guizhou, affected by pH were studied in this research work. Results show that with increase in Arsenic concentration in the soil solution, Arsenic adsorption of the soil increased, while its adsorption rate declined, high-energy adsorption sites began to gradually replace low-energy adsorption sites in absorbing As, and the absorbing reaction rate reduced. The isotherm adsorption could be well fitted by the Langmuir equation. Soil pH was an important factor that affected adsorption and desorption of Arsenic. Acid environment(pH=4~6.5) facilitated adsorption of Arsenic while alkaline environment(pH=7~8.5) did desorption of Arsenic.

关 键 词： 砷 红壤 等温吸附 方程 解吸

领　　域： [农业科学] [农业科学]