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采用人工模拟酸雨,配制含主要阴、阳离子及一定范围pH值的母液,以成都市近郊典型农业土壤水稻土为研究对象,开展自然条件下土壤对镉的静态吸附研究;揭示了水稻土对镉的吸附特征,确定了酸雨中影响土壤对镉吸附的关键因素及影响程度,建立了土壤对镉的等温吸附曲线;通过平衡模型对等温吸附曲线进行拟合,在实验设定的浓度范围内,Freundlich模型和Henry模型均具有较好的拟合性,相关指数显著,适合描述镉在供试土壤中的吸附过程。
The simulated acid rain was used to prepare the mother liquor with the main anion and cation and a range of pH values. Taking the typical agricultural paddy soil in the suburbs of Chengdu as the research object, the static adsorption of cadmium under natural conditions was studied. The key factors influencing the adsorption of cadmium in soils and the degree of influence were determined. The adsorption isotherms of cadmium in soils were established. The isothermal adsorption curves were fitted by equilibrium model. Under the experimental concentration range, Both the Freundlich model and the Henry model have good fitting properties, and the correlation index is significant, which is suitable for describing the adsorption process of cadmium in the test soil.