LODEX : sémantisation & visualisation

Site exemple

Title

The effect of aqueous sulphate on basaltic glass dissolution rates

Publication Year

2010

Author(s)
  • Flaathen, Therese K.
  • Gislason, Sigurour R.
  • Oelkers, Eric H.
Source
CHEMICAL GEOLOGY Volume: 277 Issue: 3-4 Pages: 345-354 Published: 2010
ISSN
0009-2541
Abstract

Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50 degrees C and 3<pH<10 in HCl-NaCl-NH4OH bearing solutions having an ionic strength of 0.01 M, 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 0.01 mol/kg sulphate doubled the dissolution rate while 0.10 mol/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. (C) 2010 Elsevier B.V. All rights reserved.

Author Keyword(s)
  • Basaltic glass
  • Dissolution rates
  • CO2 sequestration
  • Kinetics
  • Aqueous sulphate
  • Martian weathering
KeyWord(s) Plus
  • CARBON-DIOXIDE SEQUESTRATION
  • DEEP SALINE AQUIFERS
  • CO2 STORAGE SITE
  • CHEMICAL AFFINITY
  • KINETIC CONSTRAINTS
  • CLIMATE-CHANGE
  • ELECTROLYTE-SOLUTIONS
  • SILICATE MINERALS
  • NATURAL GLASSES
  • ATMOSPHERIC CO2
ESI Discipline(s)
  • Geosciences
Web of Science Category(ies)
  • Geochemistry & Geophysics
Adress(es)

[Flaathen, Therese K.; Oelkers, Eric H.] LMTG Univ Toulouse, CNRS IRD OMP, F-31400 Toulouse, France; [Flaathen, Therese K.; Gislason, Sigurour R.] Univ Iceland, Inst Earth Sci, IS-101 Reykjavik, Iceland

Reprint Adress

Flaathen, TK (reprint author), Dept Geosci, POB 1047 Blindern, N-0316 Oslo, Norway.

Country(ies)
  • France
  • Iceland
  • Norway
CNRS - Adress(es)
  • Géosciences Environnement Toulouse (GET), UMR5563
  • Observatoire midi-Pyrénées (OMP), UMS831
Accession Number
WOS:000283611200013
uid:/0F01K6WL
Powered by Lodex 8.21.4