Interaction of Cd and citric acid, EDTA in red soil
Adsorption and desorption process of cadmium in redsoil(Ferrisols) as well as the influence by media's pH were investigated in detail with and without citric acid and EDTA. Experimental results clearly showed that Cd adsorption in red soil was affected significantly by the coexisted organic chemicals. In the presence of citric acid and EDTA, Cd adsorption in red soil increased with pH in acid media but decreased in high pH one. Further studies placed stress on the adsorbed Cd in red soil which was found to be existed mainly as exchangeable one at pH<5.5, and desorption rate by 0.10 mol/L NaNO3 gave a peak-shaped curve due to the difference of specifically and nonspecifically adsorbed Cd with pH's change.
作 者： ZHOU Dong-mei WANG Shen-qiang CHEN Huai-man 作者单位： Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, 刊 名： 环境科学学报(英文版) ISTIC SCI 英文刊名： ENVIRON MENTAL SCIENCES 年，卷(期)： 2001 13(2) 分类号： X131.3 关键词：