陕西省几种代表性土壤NH4+吸附、解吸动力学特征研究
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KINETIC CHARACTERISTICS OF NH4+ ADSORPTION-DESORPTION FOR FIVE MAJOR SOILS IN SHAANXI PROVINCE
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    摘要:

    采用连续液流法测定了五种土壤吸附、解吸NH4+的动力学性质.研究表明:(1)NH4+吸附、解吸平衡时间及反应速率,平衡时的吸附、解吸量及吸附平衡常数均随土壤粘粒和CEC不同而变化;(2)不同动力学模型及同一模型对不同土壤的拟合性不同.NH4+吸附、解吸反应的最佳模型分别为一级反应方程及Elovich方程;(3)NH4+穿过水膜的扩散速度控制NH4+的吸附一解吸速率;(4)升高温度NH4+解吸明显加快.

    Abstract:

    The kinetic characteristics of NH4+ adsorption-desorption for five major soils in shaanxi province were studied by using the continuous fluid flow method.NH4+ adsorbing-desorbing equilibrium time and reaction rate,equilibrium adsorbing-desorbing capacity and adsorbing equilibrium constants changed with the soil clay content and CEC.Different kinetic models showed different fitting results to the data of experiment.First-order equation and Elovich equation were the best models for fitting to the data of NH4+ adsorbing and desorbing reac-dons respectively.NH4+ diffusion speed was the factor controlling the NH4+ adsorbing and desorbing rates.NH4+ desorbing rate increased significantly with raising temperature.

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薛泉宏,尉庆丰,高彦,石辉,曲东.陕西省几种代表性土壤NH4+吸附、解吸动力学特征研究[J].土壤学报,1996,33(2):129-137. DOI:10.11766/trxb199412040203 Xue Quanhong, Wei Qingfeng, Gao Yan, Shi Hui, Qu Dong. KINETIC CHARACTERISTICS OF NH4+ ADSORPTION-DESORPTION FOR FIVE MAJOR SOILS IN SHAANXI PROVINCE[J]. Acta Pedologica Sinica,1996,33(2):129-137.

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  • 收稿日期:1994-12-04
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  • 在线发布日期: 2013-02-25
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