对土壤吸附Cu的研究进行了综述。主要讨论了吸附速率,吸附等温线,表面络合模式和影响吸附量的因子等方面的问题。目前对土壤吸附Cu的速率研究主要有两种方法:一是根据实验数据绘制吸附量随时间变化的曲线,根据所绘制的曲线斜率来研究吸附动力学过程;二是选择经验性的化学动力学方程对数据进行拟和,依据较高的相关系数和较低的标准误差选择最优方程,根据吸附速率系数来进行定量的研究。土壤对Cu吸附的定量描述,经验性的吸附等温式仍不失为一个十分有用的方法;考虑到土壤性质和环境因子对吸附的影响,模型中应该加入这些参数使其更能反映土壤对重金属的吸附过程,但这方面的研究相对较少。土壤表面电荷特征、低分子有机酸对土壤吸附Cu的影响和吸附过程中Cu形态的变化等方面研究也较少。
A review is presented of the study on sorption processes of copper ion in soils, discussing mainly sorption velocity, sorption isotherm, surface complexation models and factors affecting sorption rate. There are mainly two methods for measuring sorption velocity of copper in soil at present: 1) plotting curves of sorption capability varying with time, based on experimental data and studying gradients of the plotted curves for dynamics of the sorption; and 2) selecting experiential chemical dynamic equations to fit the data and picking out an optimum equation according to the principle of higher correlation coefficient and lower standard error, to carry out quantitative research based on sorption rate coefficient. With regard to quantitative description of copper sorption in soil, the experiential equation of sorption isotherm remain to be a very useful method; Considering effects of soil properties and environmental factors on the sorption, these parameters should be added into the model, making it better reflect the sorption process of copper ion in soil; however, little has been reported on this aspect, relatively. And not much has been done on influence of soil surface charge characteristics, and low molecular organic acid on copper sorption in soil and change in from of copper in the sorption process, either.