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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)
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Submitter: 石黒 宗秀
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