R4: Mineral sciences of the Earth surface

[R4-04] Effect of the difference of wettability of mineral on dissolution behavior

*Tadashi Yokoyama¹, Naoki Nishiyama² (1. Hiroshima Univ., 2. Univ. Tsukuba)

Keywords:dissolution, pore water, wetting, water film

Water was passed through a core of Berea sandstone both under the water-saturated and the unsaturated conditions and the amounts of dissolved elements were compared. When air was present in pores the dissolution rate of Ca was slower than that in the saturated condition. Compared with Ca, the dissolution rate of Si was less affected by the presence of air. This appears to be due to the difference in the wettability of silicates and carbonate.