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Saturated hydraulic conductivity of a volcanic ash soil affected by repulsive potential energy in a multivalent anionic system

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Title: Saturated hydraulic conductivity of a volcanic ash soil affected by repulsive potential energy in a multivalent anionic system
Authors: Ishiguro, Munehide Browse this author →KAKEN DB
Nakaishi, Katsuya Browse this author
Nakajima, Tomo Browse this author
Keywords: Hydraulic conductivity
Volcanic ash soil
Repulsive potential energy
Dispersion
Flocculation
Issue Date: 10-Dec-2003
Publisher: Elsevier
Journal Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume: 230
Issue: 1-3
Start Page: 81
End Page: 88
Publisher DOI: 10.1016/j.colsurfa.2003.09.013
Abstract: Introduction:Acid rain has been a serious problem around the world. The adverse effects of acid rain on soils must be assessed. Because soils have pH-dependent charges, the solution pH affects saturated hydraulic conductivity (K) [1–7]. A volcanic ash soil whose predominant clay minerals are allophane and imogolite contains a substantial pH-dependent charge [8–10]. Its K decreases when a higher- or lower-pH solution percolates [3–6]. When dilute nitrate percolates in the soil, K decreases due to the swelling and dispersion of the soil. On the other hand, when dilute sulfate percolates, K does not decrease; under this condition, the soil neither disperses nor swells [6].Although K is supposed to decrease in response to an increase in electric repulsive force among soil particles, the relationship between K and repulsive potential energy has not been evaluated. The relationship between rheological properties and the potential energy of the interaction between sodium montmorillonite particles was discussed [11]. A numerical solution of the equation for swelling pressure in mixed systems with nonsymmetrical electrolytes was proposed [12]. However, research into repulsive potential energy in multivalent counterion systems has been rare.In this paper, repulsive potential energies for a volcanic ash soil (allophanic Andisol), which is characterized by a number of pH-dependent charges, were evaluated in an NO3–SO4 system at pH’s 3 and 4. In order to determine the mechanism of the change in K of the soil during dilute acid leaching, the relationship between K and the repulsive potential energies was evaluated. Because the acidity in rain is caused mainly by HNO3 and H2SO4, mixed dilute solutions of these acids were used in the experiment.
Rights: Copyright © 2003 Elsevier B.V. All rights reserved.,© 2003. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/70725
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石黒 宗秀

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