THE KINETICS OF CALCITE DISSOLUTION PRECIPITATION

Journal article

The channel-flow cell method is used to establish the dissolution/precipitation kinetics of calcite under wide ranges of bulk Ca1+ concentration (0-10 mM) and solution flow rate (10-30.3 cm3 s-1) for different bulk pH values. Detailed mathematical modeling of the heterogeneous reaction, and accompanying solution processes leads to the following rate equation based on a model in which Ca2+ and CO2- 3 undergo Langmuirian adsorption on the calcite surface: Dnet/mol cm-2s-1 = kbKCaKCO3 { KSP - [Ca2+]o[CO2- 3]O (1 + KCo[Ca2+]o(1 + KCO3 [CO3]o)} Here Dnet is the net flux of dissolving calcium ions, kb is a rate constant, Ksp, is the solubility product of calcite corrected for the ionic strength of the solution, KA (A = Ca2+ or CO2- 3) are Langmuirian adsorption constants, and [ ]o denotes the concentration at the Outer Helmholtz Plane. © 1993 Academic Press. All rights reserved.

Authors: Brown, C; Compton, R; Narramore, C

• Publication status: Published
• Journal: JOURNAL OF COLLOID AND INTERFACE SCIENCE More from this journal
• Volume: 160
• Issue: 2
• Pages: 372-379
• Publication date: 1993-10-15
• DOI: 10.1006/jcis.1993.1408
• ISSN: 0021-9797