The effect of aqueous sulphate on basaltic glass dissolution rates

Therese K. Flaathen; Sigurur R. Gislason; Eric H. Oelkers

doi:10.1016/j.chemgeo.2010.08.018

The effect of aqueous sulphate on basaltic glass dissolution rates

Therese K. Flaathen^*, Sigurur R. Gislason, Eric H. Oelkers

^*Corresponding author for this work

Science Institute

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50°C and 3<pH<10 in HCl-NaCl-NH₄OH bearing solutions having an ionic strength of 0.01M, or higher, as a function of aqueous sulphate concentration. Sulphate was added to reactive aqueous solutions in the form of Na₂SO₄. Measured dissolution rates increase with increased sulphate concentration in acid conditions, but little effect was found in basic conditions. At pH 5, the presence of 0.01mol/kg sulphate doubled the dissolution rate while 0.10mol/kg of sulphate tripled the dissolution rate compared to that measured in sulphate-free solutions. This rate increase is found to be consistent with that calculated using an equation previously proposed by Gislason and Oelkers (2003), where the observed rate increase stems from the formation of aqueous Al-sulphate complexes. As the release of divalent cations is thought to be the rate limiting step for CO₂ mineralization in basalt, adding aqueous sulphate to injected CO₂ could accelerate carbonization processes in this rock during carbon sequestration efforts.

Original language	English
Pages (from-to)	345-354
Number of pages	10
Journal	Chemical Geology
Volume	277
Issue number	3-4
DOIs	https://doi.org/10.1016/j.chemgeo.2010.08.018
Publication status	Published - 20 Oct 2010

Bibliographical note

Funding Information:
We are grateful to Oleg Pokrovsky, Jacques Schott, Per Aagaard and Domenik Wolff-Boenisch for their helpful discussions during the course of this study. We would also like to thank Giuseppe Saldi, Teresa Roncal Herrero, Allison Stephenson, Sam Parry, Christopher Pearce and Gabrielle Stockmann for their continued support. Support from Reykjavik Energy and the European Community through the MIN-GRO Research and Training Network ( MRTN-CT-2006-035488 ) is gratefully acknowledged.

Other keywords

Aqueous sulphate
Basaltic glass
CO sequestration
Dissolution rates
Kinetics
Martian weathering

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10.1016/j.chemgeo.2010.08.018

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title = "The effect of aqueous sulphate on basaltic glass dissolution rates",

abstract = "Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50°C and 34OH bearing solutions having an ionic strength of 0.01M, or higher, as a function of aqueous sulphate concentration. Sulphate was added to reactive aqueous solutions in the form of Na2SO4. Measured dissolution rates increase with increased sulphate concentration in acid conditions, but little effect was found in basic conditions. At pH 5, the presence of 0.01mol/kg sulphate doubled the dissolution rate while 0.10mol/kg of sulphate tripled the dissolution rate compared to that measured in sulphate-free solutions. This rate increase is found to be consistent with that calculated using an equation previously proposed by Gislason and Oelkers (2003), where the observed rate increase stems from the formation of aqueous Al-sulphate complexes. As the release of divalent cations is thought to be the rate limiting step for CO2 mineralization in basalt, adding aqueous sulphate to injected CO2 could accelerate carbonization processes in this rock during carbon sequestration efforts.",

keywords = "Aqueous sulphate, Basaltic glass, CO sequestration, Dissolution rates, Kinetics, Martian weathering",

author = "Flaathen, {Therese K.} and Gislason, {Sigurur R.} and Oelkers, {Eric H.}",

note = "Funding Information: We are grateful to Oleg Pokrovsky, Jacques Schott, Per Aagaard and Domenik Wolff-Boenisch for their helpful discussions during the course of this study. We would also like to thank Giuseppe Saldi, Teresa Roncal Herrero, Allison Stephenson, Sam Parry, Christopher Pearce and Gabrielle Stockmann for their continued support. Support from Reykjavik Energy and the European Community through the MIN-GRO Research and Training Network ( MRTN-CT-2006-035488 ) is gratefully acknowledged.",

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doi = "10.1016/j.chemgeo.2010.08.018",

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AU - Flaathen, Therese K.

AU - Gislason, Sigurur R.

AU - Oelkers, Eric H.

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PY - 2010/10/20

Y1 - 2010/10/20

N2 - Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50°C and 34OH bearing solutions having an ionic strength of 0.01M, or higher, as a function of aqueous sulphate concentration. Sulphate was added to reactive aqueous solutions in the form of Na2SO4. Measured dissolution rates increase with increased sulphate concentration in acid conditions, but little effect was found in basic conditions. At pH 5, the presence of 0.01mol/kg sulphate doubled the dissolution rate while 0.10mol/kg of sulphate tripled the dissolution rate compared to that measured in sulphate-free solutions. This rate increase is found to be consistent with that calculated using an equation previously proposed by Gislason and Oelkers (2003), where the observed rate increase stems from the formation of aqueous Al-sulphate complexes. As the release of divalent cations is thought to be the rate limiting step for CO2 mineralization in basalt, adding aqueous sulphate to injected CO2 could accelerate carbonization processes in this rock during carbon sequestration efforts.

AB - Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50°C and 34OH bearing solutions having an ionic strength of 0.01M, or higher, as a function of aqueous sulphate concentration. Sulphate was added to reactive aqueous solutions in the form of Na2SO4. Measured dissolution rates increase with increased sulphate concentration in acid conditions, but little effect was found in basic conditions. At pH 5, the presence of 0.01mol/kg sulphate doubled the dissolution rate while 0.10mol/kg of sulphate tripled the dissolution rate compared to that measured in sulphate-free solutions. This rate increase is found to be consistent with that calculated using an equation previously proposed by Gislason and Oelkers (2003), where the observed rate increase stems from the formation of aqueous Al-sulphate complexes. As the release of divalent cations is thought to be the rate limiting step for CO2 mineralization in basalt, adding aqueous sulphate to injected CO2 could accelerate carbonization processes in this rock during carbon sequestration efforts.

KW - Aqueous sulphate

KW - Basaltic glass

KW - CO sequestration

KW - Dissolution rates

KW - Kinetics

KW - Martian weathering

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The effect of aqueous sulphate on basaltic glass dissolution rates

Abstract

Bibliographical note

Other keywords

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