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The sustained and uninterrupted plume degassing at Mount Etna volcano, Southern Italy, represents the troposphere's most prominent natural source of fluorine. Of the ∼200 Mg of fluorine (as HF g ) emitted daily by the volcano, 1.6±2.7 Mg are deposited by wet and dry deposition. Fluorine-deposition via volcanic ash, here characterised for the first time, can be quite significant during volcanic...
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