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Patterns in the Organic-Acid Leaching of Fluorine from Rocks

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Abstract

Experiments were carried out on fluorine leaching from rocks (alkaline agpaitic granite, dacite, and feldspar–quartz aleurite with 0.005 M solutions of acetic, tartaric, citric, and oxalic acids. The previously revealed decrease of fluorine leaching with organic acids compared to distilled water under an acidity increase within the 6.3–3.5 range of pH values was confirmed. In terms of leaching ability related to distilled water, the organic acids constitute a series: oxalic > citric > acetic ~ tartaric. It has been proposed that a decrease of pH values causes the sorption of fluorides resulting from the substitution of adsorbed hydroxyl ions. In view of this, the less intense fluorine leaching in acids compared to distilled water might be ascribed to sorption immobilization of fluoride ions on a solid phase. A positive correlation between the levels of leached fluorine and magnesium points to the existence of some general but undetermined mechanism of the transition of these elements from minerals into aquatic solutions.

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Notes

  1. In view of the complexation and correction for activity ratios, the product of activities of calcium and oxalate ions should be lower by approximately an order of magnitude, which would not be critical for this conclusion.

  2. In parentheses, the differences of the fluorine concentrations (the average for the treated rocks) in organic-acid leaching solutions and those in distilled water, mg/L.

  3. The deviation of two points from the linear relationship between the amounts of leached fluorine and magnesium for dacite and aleurite in the experiments on oxalic acid was caused by magnesium coprecipitation with calcium oxalate, with which these waters were supersaturated.

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Funding

This study was supported by the Russian Foundation for Basic Research, project no. 18-05-01133.

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Authors and Affiliations

  1. Department of Geology, Moscow State University, 119991, Moscow, Russia

    A. V. Savenko

  2. Department of Geography, Moscow State University, 119991, Moscow, Russia

    V. S. Savenko

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  1. A. V. Savenko
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  2. V. S. Savenko
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Correspondence to A. V. Savenko.

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Translated by A. Rylova

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Savenko, A.V., Savenko, V.S. Patterns in the Organic-Acid Leaching of Fluorine from Rocks. Moscow Univ. Geol. Bull. 75, 522–526 (2020). https://doi.org/10.3103/S0145875220050075

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  • DOI: https://doi.org/10.3103/S0145875220050075

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