Interactions of Cations with Electrodialyzed Clay Fraction of Soils as Inferred from Wien Effect in Soil SuspensionsEnglish Full Text

LI CHENGBAO, S. P. FRIEDMAN and ZHAO ANZHENInstitute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China)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/ z 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 （AEC） 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+ ＞ Na+ for latosol, Ca2+ ＞ Zn2+ ＞ Mg2+ = K+ ＞ Na+ for yellow-brown soil, and Zn2+ ＞ Ca2+ ＞ Mg2+ ＞ K+ ＞ Na+ for black soil.

Keywords：

bonding strength; cation; increment of electrical conductivity; soil suspension; Wien effect;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Interactions of Cations with Electrodialyzed Clay Fraction of Soils as Inferred from Wien Effect in Soil SuspensionsEnglish Full Text

LI CHENGBAO, S. P. FRIEDMAN and ZHAO ANZHENInstitute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China)Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250 (Israel)

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