Silicic acid as a dispersibility enhancer in a Fe-oxide-rich kaolinitic soil clay
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- 作者：Minh N. Nguyena ; b ; minhnn@vnu.edu.vn" class="auth_mail" title="E-mail the corresponding author ; Flynn Picardalb ; Stefan Dultzc ; Than T.N. Dama ; Anh V. Nguyena ; Khai M. Nguyena
- 关键词：Silicic acid ; Kaolinitic soil ; Dispersion ; Light scattering ; Zeta potential
- 刊名：Geoderma
- 出版年：2017
- 出版时间：15 January 2017
- 年：2017
- 卷：286
- 期：Complete
- 页码：8-14
- 全文大小：875 K
文摘
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Silicic acid can sorb on positively charged sites of Fe oxide-rich kaolinitic soil clays.
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Resulting decrease in ζ is a key factor for dispersion of the clay fraction.
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The clearest effect of silicic acid on clay dispersion was seen at pH range from 4 to 6.
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Effect of silicic acid can be obscured in strongly acidic or alkaline conditions.
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Silicic acid may act as an enhancer to transport more Si sink (clays) from terrestrial soils into the oceans.