土壤对铜和镉的静态吸附研究

Study on the Static Absorption of Copper and Cadmium of the Soils

通过静态吸附实验研究了德兴矿区大坞河下游下沽口土壤对铜和镉的吸附特点并采用Freundlich等温吸附方程进行拟合,探讨了pH值变化对铜和镉在土壤样品中分配系数的影响。结果表明:土壤铜和镉的吸附特性均符合Freundlich等温吸附方程,得到的金属铜和镉的Kf值分别为354.08、34.132;随着pH值的升高,铜和镉在土壤中的分配系数逐步增大,随后降低,pH值与分配系数关系曲线为单峰曲线。

The absorption characteristics of copper and cadmium in the soils collected from Dexing mining area was studied by static absorption test and Freumdlich models were applied to describe the sorption data, the absorption distribution coefficients （ Kd ） of copper and cadmium in soils affected by pH value were also discussed. The results show that ： both the absorption characteristics of copper and cadmium in the soils fitted well the Freundlich isotherm, the obtained K value of copper was 354.08 and the cadmium was 34. 132 ; the Kd values of copper and cadmium in soils increased first and dropped subsequently as the pH value raised , and the relationship between pH value and Ka values conformed to a single peak curve.