Mineral-Microbe-Water Interaction on the Earth Surface

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Dissolution experiments of various silicate minerals such as smectite, kaolinite, and amorphous silica in the systems containing bacteria were performed to confirm the effects of dissolution rates of the minerals. The apparent effects of bacteria on the dissolution rates were evaluated by using cell numbers, and the inherent effects were estimated by reactive site numbers of organic molecules interacted with the mineral surfaces. Generally, bacterial dissolution of silicate minerals proceed mainly by ligand promoted processes released from the bacterial cells. Therefore, the inherent effects of bacteria on the mineral dissolution can be evaluated by reactive site numbers of the ligands. In this study, thus, dissolution rates of minerals in organic systems containing albumin or xanthan were evaluated by their reactive site numbers as a parameter of the rates.