Leaching of F? from biotite was investigated at room temperature by performing a series of short-term leach tests. The leaching of F? from biotite structure strongly depends on its weathering stage. Results of this study suggest that high concentration of F? is leached from highly weathered biotite, compared to fresh biotite. Results of dissolution experiments confirm that the organic acids in soil promote the leaching of F? from biotite compared to inorganic acids. Citric acid which is a week organic acid enhances leaching of F? from biotite structure compared to strong inorganic acid HNO3, independent of the weathering stage of biotite. Strong positive correlation between K
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