Pedosphere 10(1): 61--68, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Electrical characteristics and desorption kinetics of soil boron |
| ZHU Duan-Wei, CHEN Xiu-Hong, CHENG Dong-Sheng, GENG Ming-Jian and LIU Wu-Ding |
| Department of Resources, Environment and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China) |
| ABSTRACT |
| The status and activities of boron in soils were studied using electroultrafiltration (EUF). Soil samples, including brown-red soil and calcareous alluvial soil, were collected from Hubei Province, China. The soil samples were incubated in saturated water and then their nutrients were ultrafiltrated with EUF equipment. Filtration and extraction were conducted in accordance with routine process, but fractions in anode and cathode were all collected. Analyses of B, K+, Mg2+, Ca2+, Cl- and pH in fractions supposed that boron existed not only in a simple form of borate but also in ion-pair with cations partly in acidic soil, and borate was the primary form existing in the calcareous soil. In studying desorption kinetics with EUF, the boron content of fractions 2~6 was accumulated, and the accumulative quantities were fit to time factors in three kinetic equations: the zero-order, first-order, and parabolic diffusion equations. The parabolic diffusion equation had the best degree of fit, followed by the zero-order equation, and the first-order equation was the worst. |
| Key Words: boron, desorption kinetics, electro-ultrafiltration, soil |
| Citation: Zhu, D. W., Chen, X. H., Cheng, D. S., Geng, M. J. and Liu, W. D. 2000. Electrical characteristics and desorption kinetics of soil boron. Pedosphere. 10(1): 61-68. |
|
View Full Text
|
|
|
|
