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本文研究了不同肥力三种黑土和两种棕壤对磷酸盐的等温吸附作用、吸附速率,以及黑土对磷酸盐的吸附动力学特征。应用Langmuir等温式模拟表明,不同肥力土壤的K值和M值有明显差异,K和M乘积值与土壤肥力的关系更密切。在一周内土壤吸附磷的速率极高,一周后急剧下降,到8周趋于隐定,不同肥力土壤表现不同。应用三种动力学方程,即二级反应方程、(dc/dt=k_2C~2)、Elovich方程(dq/dt=ae~(βq))和经验方程(-dc/dt=k_0·1/t~2)模拟,虽均达显著水平,但后两个方程中的参数能反映出土壤肥力状况。把Elovich与经验方程结合起来能完整表达其吸附动力学特征。
In this paper, the isothermal adsorption of phosphate on three black soils and two brown soils with different fertility, the adsorption rate and the adsorption kinetics of phosphate on black soil were studied. Langmuir isothermal simulations showed that there was a significant difference between K and M values in different fertile soils, and the relationship between K and M values was more closely related to soil fertility. The rate of P uptake by soil in a week was extremely high, dropping sharply one week later and tended to be steady at 8 weeks. Soils with different fertility showed different performances. Three kinetic equations, namely, the second order reaction equation (dc / dt = k_2C ~ 2), the Elovich equation (dq / dt = aeβq) and the empirical equation (-dc / dt = k_0 · 1 / t ~ 2). Although the parameters of the latter two equations can reflect the soil fertility status, Combining Elovich with the empirical equation gives a complete representation of its adsorption kinetics.