铬在土壤中的吸附解吸研究进展

对铬在土壤中的吸附解吸研究进行了综述,土壤中铬的吸附解吸机理包括非专性吸附(离子交换吸附)、专性吸附以及物理表面吸附,分别对pH、氧化还原电位、土壤组分(土壤矿物和有机质)、竞争离子以及离子强度等因素对铬吸附解吸的影响作了论述。文章进一步描述了土壤中铬吸附解吸的数学模型Freundlich方程、Langmuir方程、一级动力学模型、金属-腐殖酸模型(one-sitemodel)和表面络合模型-扩散层模型(DLM)等的研究情况,并对今后的研究方向进行了探讨。

Advance in Studies of Chromium Sorption and Desorption in Soils

Chromium sorption and desorption on soils were reviewed in this paper. Processes of sorption were differentiated into specific sorption,nonspecific sorption and physical adsorption. Some factors affecting chromium sorption and desorption including pH,soil characteristics(clay minerals and organic matter),redox potential,competition of other ions and concentration of electrolytes. Empirical and mechanistic sorption models in the application of chromium sorption and desorption such as Freundlich and Langmuir isotherms were summarized. Finally the main points facing in the future have been discussed.