Pedosphere 10(4): 355--362, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of phosphate adsorption on adsorption-desorption and availability of Cu and Zn ions in Ultisols and Alfisols |
| LI Xue-Yuan, DONG Yuan-Yan and LUO Hou-Ting |
| Key Laboratory of Subtropical Soil Resources and Environment, Chinese Ministry of Agriculture, Huazhong Agricultural University, Wuhan 450070 (China) |
| ABSTRACT |
| Surface charge, secondary adsorption-desorption and form distribution of Cu2+ and Zn2+ in Ultisols and Alfisols having adsorbed phosphate were studied by potentiometric titration, adsorption equilibrium and sequential extraction method, respectively. The soil surface negative charges increased whereas the amount of positive charges decreased with increase of P adsorbed. The soil secondary adsorption capacity for Cu2+ and Zn2+ was positively significantly correlated with the amount of P adsorbed by the soils, which could be described by the Langmuir equation. The amounts of Cu2+ and Zn2+ desorption from soils were decreased after P adsorption by the soils and the relationship between them was linear. After the soils adsorbed P, form distribution of Cu2+ and Zn2+ in soils changed remarkably. |
| Key Words: adsorption-desorption, Alfisol and Ultisol, availability, Cu2+ and Zn2+, phosphate adsorption |
| Citation: Li, X. Y., Dong, Y. Y. and Luo, H. T. 2000. Effects of phosphate adsorption on adsorption-desorption and availability of Cu and Zn ions in Ultisols and Alfisols. Pedosphere. 10(4): 355-362. |
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