Preliminary studies on the batch-dissolution kinetics of calcite with reactors open and closed to CO2
Victor W. Truesdale
A C and Jim Greenwood B
+ Author Affiliations
- Author Affiliations
A CSIRO National Geosequestration Laboratory, Australian Resource Research Centre, Kensington, WA 6152, Australia.
B CSIRO Oceans and Atmospheres, Indian Ocean Marine Research Centre, Crawley, WA 6009, Australia.
C Corresponding author. Email: victruesdale@gmail.com
Environmental Chemistry 16(2) 101-113 https://doi.org/10.1071/EN18231
Submitted: 11 April 2018 Accepted: 17 November 2018 Published: 17 December 2018
Environmental context. The dissolution of minerals in fresh or sea-waters is a critical environmental process. The rate at which substances dissolve, from the dissolution of calcite crystals to the weathering of mountains, can influence major global issues such as climate change and sea-level rise. This paper explores a new solution-based rate equation for mineral dissolution that has profound environmental consequences.
Abstract. This paper continues the search for a reliable, solution-based, rate equation for mineral dissolution, as the one dominant for over 40 years has recently been challenged by the Shrinking Object (SO) model. This study is needed to remedy several major environmental problems of immense social and economic importance including climate change, ocean acidification and industrial waste disposal. This paper describes the preliminary investigation of how reactors open and closed to CO2, which are used to study calcite dissolution, ought to be used with the SO model to gain maximum advantage. The open reactor is re-conceptualised as a constant head device for dissolved inorganic carbon, to give the kineticist a mechanistic description of it, to flesh out the thermodynamic categorisation. Application of this reveals that the recent experiments conducted in a reactor blown with CO2-free N2, which were central to the establishment of the concept of non-ideal dissolution of calcite, would have exaggerated the effect. Although this current study was still unable to determine conditions where the effect was absent, it does seem that it will be possible to skirt around this in the future, by approximating the classic works on the variation with pH of the initial rate of dissolution to full reaction curves from the SO model, which are exponential. To guide workers towards a further round of laboratory investigation on this, practical work on the dissolution of calcite crystallites in 0.311 M Tris buffer at pH 8 or 9, under various partial pressures of CO2, in different reactors, and under various stirring and filtration strategies, is presented. Improved data runs, with unparalleled, strategically-spaced samplings, which show up the finer details of dissolution, can now be anticipated.
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