论文部分内容阅读
用平衡吸附法研究了湖北省５种类型土壤对Ｋ＋的吸附特征，探讨了溶液Ｋ＋浓度、ｐＨ值及离子强度对土壤吸附Ｋ＋的影响。结果表明：（１）土壤对Ｋ＋的吸附量随溶液中Ｋ＋浓度升高而增加，支持电解质的阳离子可同时被吸附，对Ｋ＋吸附的机制有电性作用和矿物对Ｋ＋的选择性吸附；（２）ｐＨ值升高，Ｋ＋的吸附量增加，在供试ｐＨ范围内，增幅为２１．３％～４０．２％，单位ｐＨ变化对Ｋ＋吸附量的影响为０．５９～１．４３ｍｍｏｌ／ｋｇ；（３）离子强度由０．０１增至０．２０时，Ｋ＋吸附量降低２２．５％～５５．４％；（４）以上因子的影响程度因土壤而明显不同，主要取决于其矿物组成和表面电荷性质。
The adsorption characteristics of K + in five types of soils in Hubei Province were studied by equilibrium adsorption. The effects of K + concentration, pH value and ionic strength on K + adsorption were discussed. The results showed that: (1) The amount of K + adsorbed by the soil increased with the increase of K + concentration in the solution, the cation of the supporting electrolyte could be adsorbed at the same time, and the K + adsorption mechanism and the mineral selective adsorption of K + 2) The increase of pH value and the increase of K + adsorption amount increased by 21.3% -40.2% in the range of test pH, and the influence of unit pH value on the amount of K + adsorption was 0.59-1.43 mmol / kg; (3) K + adsorption decreased by 22.5% -55.4% when the ionic strength increased from 0.01 to 0.20; (4) The influence degree of the above factors was obviously different due to soil, which mainly depended on Mineral composition and surface charge properties.