2009 Fiscal Year Final Research Report
Diffusion property of dissolved silica in rock pore water
| Project/Area Number |
20740308
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Osaka University |
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Principal Investigator |
YOKOYAMA Tadashi Osaka University, 大学院・理学研究科, 助教 (60403101)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 拡散 / 溶存シリカ / 間隙水 / 砂岩 / 流紋岩 |
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| Research Abstract |
To study the relationship between the diffusion coefficient of dissolved Si and the chemical form of dissolved Si, through diffusion experiments were conducted at pH 6, 9.5 and 11 using sandstone and rhyolite. The diffusion coefficients of K^+ and Cl^- as well as that of dissolved Si were determined. As pH increased, the effective diffusion coefficient of dissolved Si increased and approached to those of K^+ and Cl^-. One possible reason for the pH dependence of the diffusion of dissolved Si might be that as pH increases dissolved Si become less sorbed on negatively charged pore wall surfaces.
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