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对中南地区花岗岩上发育的5种土壤的氟吸附特征及其与磷、硫竞争吸附的研究结果表明:(1)土壤对氟的吸附量随加入氟浓度增大而增加,且在吸附时不断释放OH-,使平衡液pH升高。氟吸附容量的大小次序为:红壤>赤红壤>黄棕壤和砖红壤。氟吸附与Langmuir方程、Fre-undlich方程和Temkin方程有极好的拟合性;(2)氟、磷、硫之间存在着竞争吸附,在磷酸根或硫酸根存在时,土壤对氟的吸附量增加,氟吸附等温线位置上移,曲线斜率变大。
The results showed that: (1) The adsorption of fluorine to soil increased with the increase of fluoride concentration and continued to be adsorbed Release OH- to raise the pH of the balance solution. The order of fluorine adsorption capacity is as follows: red soil> red soil> yellow brown soil and red soil. Fluorine adsorption has excellent fitting with Langmuir equation, Freundlich equation and Temkin equation. (2) There exists competitive adsorption between fluorine, phosphorus and sulfur. In the presence of phosphate or sulfate, fluoride adsorption Increasing the amount of fluorine adsorption isotherm position up, the slope of the curve becomes larger.