摘要
采用等温静态平衡吸附实验确定了重金属铜离子在3种不同质地土壤(砂质壤土,粉砂质粘土,壤质砂土)中的阻滞因子R,然后,结合混合置换实验中测定的铜离子和示踪剂离子的出流动态,采用了确定性平衡对流-弥散方程和确定性非平衡两区对流-弥散方程计算阻滞因子R。结果表明,Langmuir等温线形吸附方程可以准确描述铜离子的吸附特性;确定性平衡模型计算的R值与实测值接近;采用混合置换实验结合对流-弥散方程计算阻滞因子的方法耗时较长,精度不高。
Retarding factors of copper movement in sandy loam, silty clay and loamy sand were determined in an experiment of isothermal static equilibrium adsorption and calculated by using the deterministic convection-dispersion equation and deterministic two-region nonequilibrium convection-dispersion equation coupled with the outflowing dynamics of copper ions and tracer ions measured in a miscible displacement experiment. The results indicate that the Langmuir linear isothermal adsorption could accurately describe adsorption behavior of copper; and that retarding factors calculated were close to measured values. In addition, to determine retarding factors, the method of using the miscible displacement experiments coupled with the convectiondispersion equation was both time-consuming and low in accuracy.
出处
《土壤学报》
CAS
CSCD
北大核心
2005年第6期930-935,共6页
Acta Pedologica Sinica
基金
国家自然科学基金项目(40271059)资助
关键词
铜离子
对流-弥散方程
混合置换实验
阻滞因子
穿透曲线
Copper
Convection-dispersion equation
Miscible displacement experiments
Retarding factor
Breakthrough curve
