黄土性土壤K+吸附、解吸动力学研究
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STUDY ON K+ ADSORBING-DESORBING KINETICS OF LOESSIAL SOIL
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    摘要:

    采用连续液流法研究了5种黄土性土壤吸附、解吸K+的动力学性质。结果表明:(1)供试土壤K+吸附、解吸反应分别在16-24及26-60min达到平衡。吸附平衡时间及平衡吸附量与CEC及粘粒含量有关。(2)平衡前不同时段的吸附解吸速度及吸附解吸率与反应时间1nt间存在极显著的线性关系。其中反应速度直线和解吸率直线的斜率、初始反应速度及初始解吸率均与CEC及粘粒含量密切相关。(3)一级反应方程和Elovich方程分别为描述K+吸附、解吸反应的最优模型。(4)K+的吸附、解吸以快、中、慢不同速率进行,反映出土壤固相表面存在不同能态的K+吸附点。(5)土壤对K+的吸附、解吸是扩散控制过程。

    Abstract:

    The characteristies of K+ adsorbing-desorbing kinetics of five loessial soils were studied by the liquid flow technique. The results indicated that:①K+ adsorption and desorption equilibrated in 16-24 and 24-60 min, respectively, and the time and the capacity of K+ equilibrium adsorption were closely related with soil clay content and CEC;②there was a linear relationship between the K+ adsorbing-desorbing velocity and the reaction time lnt, and the slop of reaction velocity regression equation and K+ desorbing percentage regression equation, the original reaction velocity and the original desorbing percentage were closely related with soil clay and CEC;③First-order and Elovich equations were the best modles for K+ adsorption and desorption, respectively;④it is demonstrated that there were dif ferent energy level sites of K+ adsorption at the surface of soil colloid by the fast, medium and slow reactions of K+ adsorbing-desorbing;and ⑤the K+ adsorption and desorption were controlled by the diffussion process.

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薛泉宏,尉庆丰,李宝安,赵翀.黄土性土壤K+吸附、解吸动力学研究[J].土壤学报,1997,34(2):113-122. DOI:10.11766/trxb199403300201 Xue Quanhong, Wei Qingfeng, Li Baoan, Zhao Chong. STUDY ON K+ ADSORBING-DESORBING KINETICS OF LOESSIAL SOIL[J]. Acta Pedologica Sinica,1997,34(2):113-122.

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  • 收稿日期:1994-03-30
  • 最后修改日期:1996-09-14
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  • 在线发布日期: 2013-02-25
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