Guo Zhaohui, Huang Changyong, Liao Bohan
College of Environment and Resource Science, Zhejiang University, Hangzhou 310029, China.
Ying Yong Sheng Tai Xue Bao. 2003 Sep;14(9):1547-50.
The release and form transformation of Cd, Cu, and Zn in polluted red soil and yellow red soil affected by simulated acid rains were studied through batch equilibrium experiments. The results showed that the release of test heavy metals increased significantly with decreasing pH value of simulated acid rain. Their release amount was negatively correlated to the pH value of acid rains. In polluted red soil and yellow red soil, Cd existed mainly in exchangeable form, and Cu in organically bound and Mn oxide-occluded forms. Zn existed mainly in residual and exchangeable forms in polluted red soil, and in residual and organically bound forms in polluted yellow red soil. To some extents, the release of Cd, Cu and Zn and the chemical forms of Cd and Zn in test soils were affected by soil organic matter content and CEC. The release amount of bio-available Cd and Cu in polluted red soil and yellow red soil was increased greatly with the increasing acidity of simulated acid rains, but the transformation of Zn from stable to bio-available form was not obvious.
通过批次平衡实验研究了模拟酸雨对污染红壤和黄红壤中镉、铜、锌释放及形态转化的影响。结果表明，随着模拟酸雨pH值的降低，试验重金属的释放量显著增加。它们的释放量与酸雨的pH值呈负相关。在污染红壤和黄红壤中，镉主要以交换态存在，铜以有机结合态和锰氧化物结合态存在。在污染红壤中，锌主要以残渣态和交换态存在，在污染黄红壤中，锌主要以残渣态和有机结合态存在。在一定程度上，试验土壤中镉、铜、锌的释放以及镉、锌的化学形态受土壤有机质含量和阳离子交换量的影响。随着模拟酸雨酸度的增加，污染红壤和黄红壤中生物可利用态镉和铜的释放量大幅增加，但锌从稳定态向生物可利用态的转化不明显。
