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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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タイトル: Saturated hydraulic conductivity of a volcanic ash soil affected by repulsive potential energy in a multivalent anionic system
著者: Ishiguro, Munehide 著作を一覧する
Nakaishi, Katsuya 著作を一覧する
Nakajima, Tomo 著作を一覧する
キーワード: Hydraulic conductivity
Volcanic ash soil
Repulsive potential energy
Dispersion
Flocculation
発行日: 2003年12月10日
出版者: Elsevier
誌名: Colloids and Surfaces A: Physicochemical and Engineering Aspects
巻: 230
号: 1-3
開始ページ: 81
終了ページ: 88
出版社 DOI: 10.1016/j.colsurfa.2003.09.013
抄録: 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/
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/70725
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 石黒 宗秀

 

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