Interactions of Cations with Electrodialyzed Clay Fraction of Soils as Inferred from Wien Effect in Soil Suspensions

The electrical conductivities (ECs) of suspensions containing 25 and 30 g kg-1 solids prepared from theelectrodialyzed clay fraction (＜ 2 μm in diameter) of latosol, yellow-brown soil, and black soil, dispersed invarious nitrate solutions having concentrations of 1 × 10-4/z mol L-1, where z is the valence, and in distilledwater, were measured at field strengths ranging from 14 kV cm-1 to 210 kV cm-1. On the basis of analysesof 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 theincrement of EC (△EC) and/or relative electrical conductivity (REC) can indicate the bonding strengthbetween cations and soil particles. The bonding strengths of various cations with the soils diminished in theorder: K+ ＞ Zn2+ ＞ Mg2+ ＝ Ca2+ ＞ Na+ for latosol, Ca2+ ＞ Zn2+ ＞ Mg2+ ＝ K+ ＞ Na+ for yellow-brownsoil, and Zn2+ ＞Ca2+ ＞ Mg2+ ＞ K+ ＞ Na+ for black soil.

作 者： Li Chengbao S.P.FRIEDMAN ZHAO ANZHEN   作者單位： Li Chengbao,ZHAO ANZHEN(Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China))

S.P.FRIEDMAN(Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250 (Israel)) 

刊 名： 土壤圈(意譯名)  ISTIC SCI 英文刊名： PEDOSPHERE  年，卷(期)： 2003 13(1)  分類號： S15  關鍵詞： bonding strength   cation   increment of electrical conductivity   soil suspension   Wien effect