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Publication Detail
Does variscite control phosphate availability in acidic natural waters? An experimental study of variscite dissolution rates
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Roncal-Herrero T, Oelkers EH
  • Publication date:
  • Pagination:
    416, 426
  • Journal:
    Geochimica et Cosmochimica Acta
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
The dissolution rates of natural, well crystallized variscite (AlPO4·2H2O) were determined from the evolution of aqueous Al and P concentrations in closed and open-system mixed-flow reactors at 25°C and pH from 1.5 to 9.0. Measured dissolution rates decrease with increasing pH, from 6×10-16mol/cm2/s at pH 1.5 to 5×10-17mol/cm2/s at pH 5.89, and then increase with increasing pH to 4×10-16mol/cm2/s at pH 9.0. Geochemical modeling calculations, performed using measured dissolution rates, indicate that it would take no more than a few weeks or months to equilibrate a mildly acidic, Al and P-free solution with variscite. Hence, variscite can buffer aqueous phosphate concentrations in mildly acidic near surface environments. This conclusion is confirmed by consideration of the compositions of natural waters. © 2010 Elsevier Ltd.
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