Pedosphere 13(1): 59--66, 2003
ISSN 1002-0160/CN 32-1315/P
©2003 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Interactions of cations with electrodialyzed clay fraction of soils as inferred from wien effect in soil suspensions |
| LI Cheng-Bao1, S. P. FRIEDMAN2 and ZHAO An-Zhen1 |
1 Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China);
2 Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250 (Israel) |
| ABSTRACT |
| The electrical conductivities (ECs) of suspensions containing 25 and 30 g kg-1 solids prepared from the electrodialyzed clay fraction (< 2μm in diameter) of latosol, yellow-brown soil, and black soil, dispersed in various nitrate solutions having concentrations of 1 × 10-4/2 mol L-1, where z is the valence, and in distilled water, were measured at field strengths ranging from 14 kV cm-1 to 210 kV cm-1. On the basis of analyses of the charge density and exchangeable ion composition on the surfaces of soil particles in the suspensions, and of the characters of the EC-field strength curves of the various suspensions, it was inferred that the increment of EC (△EC) and/or relative electrical conductivity (REC) can indicate the bonding strength between cations and soil particles. The bonding strengths of various cations with the soils diminished in the order: K+ > Zn2+ > Mg2+ = Ca2+ > Na2+ for latosol, Ca2+ > Zn2+ > Mg2+ = K+ > Na2+ for yellow-brown soil, and Zn2+ ≥ Ca2+ ≥ Mg2+ > K+ > Na2+ for black soil. |
| Key Words: bonding strength, cation, increment of electrical conductivity, soil suspension, Wien effect |
| Citation: Li, C. B., Friedman, S. P. and Zhao, A. Z. 2003. Interactions of cations with electrodialyzed clay fraction of soils as inferred from wien effect in soil suspensions. Pedosphere. 13(1): 59-66. |
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