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为探究阴离子在土壤中的吸附和迁移特征,采用静态吸附和土柱出流试验研究了硝酸根、硫酸根、氯离子在棕壤中的吸附和迁移行为,获得了硝酸根、硫酸根、氯离子的吸附等温线和穿透曲线,并用Origin9.0软件拟合试验结果,获得了吸附参数。由静态等温吸附试验结果表明:棕壤对3种阴离子的吸附能力关系为硝酸根>硫酸根>氯离子,且随着溶液阴离子浓度的增加,吸附量增加;用Langmuir方程拟合效果好于Freundlich方程。
In order to explore the adsorption and migration characteristics of anions in soils, the adsorption and migration behaviors of nitrate, sulfate and chloride ions in brown soil were studied by static adsorption and soil column outflow test. Nitrate, sulfate, chloride Ion adsorption isotherms and penetration curves, and the Origin9.0 software fitting test results obtained adsorption parameters. The results of static isothermal adsorption experiments show that the adsorption capacity of brown soil to three anions is nitrate> sulfate> chloride, and the adsorption capacity increases with the increase of anion concentration. The fitting effect by Langmuir equation is better than Freundlich equation.