Simulation study on copper and zinc release from contaminated sandy soils due to acidification

Afforestation in sandy soils can cause soil acidification and affect Cu and Zn release. The behaviors of Cu and Zn release from contaminated arable sandy soils were investigated in the laboratory with the methods of simulated acidification of the soils. The results showed that soil acidification could change chemical forms of Cu and Zn in the soils, impel the transformation of Cu and Zn from carbonate associated fractions to exchangeable, organic matter and oxides associated fractions, and thus increase the release potential of Cu and Zn in the soils. The effect of the acidification on Zn leaching was more significant than that of Cu. Water solubility of Cu and Zn in the soils was increased with decreasing pH, and the solubility of Cu and Zn was increased exponentially at pH 3.8-4.5, and 6.2-6.5, respectively.

在砂质土的造林能引起土壤使发酸并且影响 Cu andZn 版本。Cu 和 Zn 的行为免除污染可耕的砂质土我们在有土壤的模仿的使发酸的方法的实验室的 reinvestigated。结果证明土壤使发酸能在土壤改变 Cu 和 Zn 的化学形式，从碳酸盐推动 Cu 和 Zn 的转变联系部分到可交换，有机物和氧化物联系了部分，并且因此在土壤增加 Cu 和 Zn 的版本潜力。沥滤的 Zn 上的使发酸的 Theeffect 比 Cu 的更重要。在土壤的水溶解度 ofCu 和 Zn 与减少的 pH 被增加，并且 Cu 和 Zn 的溶解度分别地在 pH 3.8-4.5，和 6.2-6.5 指数地被增加。