Stability on the ^(109)Cd,^(65)Zn Complex with Humus Acids
Stability on the ^(109)Cd,^(65)Zn Complex with Humus Acids作者机构：Geology Department Capital Normal University Beijing 100037 P. R . China Institute for Application of Atomic Energy Chinese Academy of Agricultural Sciences Beijing 100094 P. R. China Institute for Application of Atomic Energy Chinese Academy of Agricultural Sciences Beijing 100094 P. R. China
出 版 物：《Agricultural Sciences in China》 (中国农业科学（英文版）)
年 卷 期：2002年第1卷第5期
页 面：520-525页
学科分类：090101[农学-作物栽培学与耕作学] 09[农学] 0901[农学-作物学]
基 金：supported by the National Natural Science Foundation of China(49971049)
主 题：Humus acid Complex Cadmium Zinc Stability of complex Isotope tracer technique
摘 要：The radioactive isotope tracer and ion exchange balanced method was used to study the stability of 109Cd, 65 Zn complexes with humus acids. In the 109Cd and 65 Zn single existing system with humic acids, the stability constants of the humic-109Cd(65Zn) complex compound was higher than the fulvic-109 Cd(65Zn) complex compound. The stability constant of the humic (fulvic) -65Zn was higher than that of the humic (ful-vic)-109Cd. In the 109Cd and 65 Zn coexisting system, the stability constant and the co-ordination number of the humic (fulvic)-65Zn complex obviously increased, but the stability constant and the co-ordination number of the humic (fulvic)-109Cd complex obviously decreased as compared with its respectively single existing system . The result showed that the humus matter with higher molecular weight could more effectively reduce plant availability of heavy metals than that with lower molecular weight in polluted soil by heavy metals. The humus matter could more effectively reduce plant availability of Zn than that of Cd. Application of humus-acid increased the harm of Cd and decreased the harm of Zn to plants in Cd-Zn coexisting system.
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