The effect of aqueous sulphate on basaltic glass dissolution rates

Authors: Flaathen, T.K.; Oelkers, E.H.; Gislason, S.

Source: Mineralogical Magazine, Volume 72, Number 1, February 2008 , pp. 39-41(3)

Publisher: Mineralogical Society

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Abstract:

Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50°C at pH 3 and 4 as a function of aqueous sulphate concentration. Dissolution rates in the presence of 0.1 moles/kg SO₄²⁻ were found to be ∼3 times greater than those in corresponding SO₄²⁻ free solutions. This rate increase is found to be approximately consistent with that calculated using a rate equation previously proposed by Gislason and Oelkers (2003). These results suggest that the addition of sulphate to injected CO₂ may facilitate CO₂ sequestration in basalts by accelerating basaltic glass dissolution rates thus more rapidly releasing aqueous Ca and Mg to solution.

Keywords: BASALTIC GLASS; DISSOLUTION RATES; CO2 SEQUESTRATION; KINETICS; AQUEOUS SULPHATE

Document Type: Research article

DOI: 10.1180/minmag.2008.072.1.39

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