Lizardite serpentine dissolution kinetics as a function of pH and temperature, including effects of elevated pCO(2) | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

Twitter

Aller au compte twitter

  Lizardite serpentine dissolution kinetics as a function of pH and temperature, including effects of elevated pCO(2)

Type de publication:

Journal Article

Source:

Chemical Geology, Volume 351, p.245-256 (2013)

ISBN:

0009-2541

Mots-clés:

UMR 7154 ; Géobiosphère actuelle et primitive ; Serpentine; Dissolution rate laws; CO2 sequestration; Hydrothermal fluids; Phyllosilicates; Weathering

Résumé:

Measurements of the dissolution rate of lizardite (r) were carried out as a function of pH (2.5 ≤ pH ≤ 6.7) and temperature (27 °C ≤ T ≤ 90 °C) in continuously stirred flow-through systems, either in liquid-filled reactors or in aqueous solutions equilibrated with a headspace of gaseous CO2 (4 MPa ≤ pCO2 ≤ 6 MPa). For the whole dataset, the stoichiometry of the reaction was highly correlated with the extent of Mg release, and congruent reactions were observed for the whole pH range only at T = 90 °C. Far from equilibrium, dissolution rates in dilute HCl solutions based on Si release and normalized to BET surface area can be described by:View the MathML sourceTurn MathJax on