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Title

Do carbonate precipitates affect dissolution kinetics? 2: Diopside

Publication Year

2013

Author(s)
  • Stockmann, Gabrielle J.
  • Wolff-Boenisch, Domenik
  • Gislason, Sigurdur R.
  • Oelkers, Eric H.
Source
CHEMICAL GEOLOGY Volume: 337 Pages: 56-66 Published: 2013
ISSN
0009-2541
Abstract

Diopside dissolution rates were measured in mixed-flow reactors at neutral and basic pH at 25 degrees C and 70 degrees C. Experiments were performed in aqueous solutions 1) supersaturated with respect to calcite for up to 63 days, and 2) strongly undersaturated with respect to calcite and other secondary phases for up to 164 days. Inlet solutions were comprised of NaHCO3, CaCl2, NH4Cl, NaOH, and/or HCl with ionic strengths ranging from 0.01 to 0.09 mol/kg. In the experiments performed at 25 degrees C, calcite nucleated and grew extensively on both the diopside surfaces, and as <1000 mu m discrete crystals in experiments performed in CO3-bearing inlet solutions but no precipitates were formed on or adjacent to the diopside in experiments performed in CO3-free inlet solutions. Measured diopside dissolution rates in calcite precipitating experiments at 25 degrees C based on Si are both 1) time independent, and 2) equal to that of corresponding control experiments performed in NaHCO3-free inlet solutions. These observations indicate that diopside dissolution rates are unaffected by the simultaneous precipitation of calcite. Calcite likely forms a porous coating on diopside, which allows ions from the dissolving diopside to be transported readily to the bulk fluid. It seems therefore likely that carbonate precipitation will not slow pyroxene dissolution during carbon storage efforts. (C) 2012 Elsevier B.V. All rights reserved.

Author Keyword(s)
  • Diopside
  • Calcite coating
  • Dissolution kinetics
  • Mixed-flow reactors
  • Carbonatization
  • CO2 sequestration
KeyWord(s) Plus
  • CO2 MINERAL SEQUESTRATION
  • HYDROTHERMAL BASALT ALTERATION
  • DIOXIDE SEQUESTRATION
  • CHEMICAL AFFINITY
  • NATURAL GLASSES
  • RATE CONSTANTS
  • PILOT PROJECT
  • DEGREES-C
  • PH 4
  • RATES
ESI Discipline(s)
  • Geosciences
Web of Science Category(ies)
  • Geochemistry & Geophysics
Adress(es)

[Stockmann, Gabrielle J.] Univ Iceland, Inst Earth Sci, Nord Volcanol Ctr, IS-101 Reykjavik, Iceland; [Stockmann, Gabrielle J.; Oelkers, Eric H.] Univ Toulouse, GET, CNRS, IRD,OMP, F-31400 Toulouse, France; [Wolff-Boenisch, Domenik; Gislason, Sigurdur R.; Oelkers, Eric H.] Univ Iceland, Inst Earth Sci, IS-101 Reykjavik, Iceland

Reprint Adress

Stockmann, GJ (reprint author), Univ Gothenburg, Dept Earth Sci, Guldhetsgatan 5A, S-41320 Gothenburg, Sweden.

Country(ies)
  • France
  • Iceland
  • Sweden
CNRS - Adress(es)
  • Géosciences Environnement Toulouse (GET), UMR5563
  • Observatoire midi-Pyrénées (OMP), UMS831
Accession Number
WOS:000314738600007
uid:/FXLNDVMR
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