Do organic ligands affect calcite dissolution rates?

2011 ◽  
Vol 75 (7) ◽  
pp. 1799-1813 ◽  
Author(s):  
Eric H. Oelkers ◽  
Sergey V. Golubev ◽  
Oleg S. Pokrovsky ◽  
Pascale Bénézeth
Keyword(s):  
Organic Ligands ◽  
Dissolution Rates ◽  
Calcite Dissolution

Assessing the Effect of Dissolved Organic Ligands on Mineral Dissolution Rates: an Example from Calcite Dissolution

1996 ◽  
Vol 465 ◽  
Author(s):  
Teri DeMaio ◽  
D. E. Grandstaff
Keyword(s):  
Dissolution Rate ◽  
Organic Ligand ◽  
Mineral Dissolution ◽  
Organic Ligands ◽  
Dissolution Rates ◽  
Surface Complexes ◽  
Calcite Dissolution ◽  
Low Concentrations ◽  
Rate Versus ◽  
Metal Ligand

ABSTRACTExperiments suggest that dissolved organic ligands may primarily modify mineral dissolution rates by three mechanisms: (1) metal-ligand (M-L) complex formation in solution, which increases the degree of undersaturation, (2) formation of surface M-L complexes that attack the surface, and (3) formation of surface complexes which passivate or “protect” the surface. Mechanisms (1) and (2) increase the dissolution rate and the third decreases it compared with organic-free solutions. The types and importance of these mechanisms may be assessed from plots of dissolution rate versus degree of undersaturation.To illustrate this technique, calcite, a common repository cementing and vein-filling mineral, was dissolved at pH 7.8 and 22°C in Na-Ca-HCO3-Cl solutions with low concentrations of three organic ligands. Low citrate concentrations (50 μm) increased the dissolution rate consistent with mechanism (1). Oxalate decreased the rate, consistent with mechanism (3). Low phthalate concentration (< 50 μM) decreased calcite dissolution rates; however, higher concentrations increased the dissolution rates, which became faster than in inorganic solutions. Thus, phthalate exhibits both mechanisms (2) and (3) at different concentrations. In such cases linear extrapolations of dissolution rates from high organic ligand concentrations may not be valid.

scholarly journals Cave airflow patterns control calcite dissolution rates within a cave stream: Blowing Springs Cave, Arkansas, USA

2020 ◽  
Author(s):  
Matthew Covington ◽  
Katherine Knierim ◽  
Holly Young ◽  
Josue Rodriguez ◽  
Hannah Gnoza
Keyword(s):  
Dissolution Rates ◽  
Calcite Dissolution

scholarly journals A Statistical Approach for Analysis of Dissolution Rates Including Surface Morphology

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 458 ◽  
Author(s):  
Elisabete Trindade Pedrosa ◽  
Inna Kurganskaya ◽  
Cornelius Fischer ◽  
Andreas Luttge
Keyword(s):  
Mineral Dissolution ◽  
Etch Pits ◽  
Dissolution Rates ◽  
Calcite Dissolution ◽  
Crystal Dissolution ◽  
Vertical Scanning Interferometry ◽  
Surface Morphologies ◽  
Micrometer Scale ◽  
Flow Experiments

Understanding mineral dissolution is relevant for natural and industrial processes that involve the interaction of crystalline solids and fluids. The dissolution of slow dissolving minerals is typically surface controlled as opposed to diffusion/transport controlled. At these conditions, the dissolution rate is no longer constant in time or space, an outcome observed in rate maps and correspondent rate spectra. The contribution and statistical prevalence of different dissolution mechanisms is not known. Aiming to contribute to close this gap, we present a statistical analysis of the variability of calcite dissolution rates at the nano- to micrometer scale. A calcite-cemented sandstone was used to perform flow experiments. Dissolution of the calcite-filled rock pores was measured using vertical scanning interferometry. The resultant types of surface morphologies influenced the outcome of dissolution. We provide a statistical description of these morphologies and show their temporal evolution as an alternative to the lack of rate spatial variability in rate constants. Crystal size impacts dissolution rates most probably due to the contribution of the crystal edges. We propose a new methodology to analyze the highest rates (tales of rate spectra) that represent the formation of deeper etch pits. These results have application to the parametrization and upscaling of geochemical kinetic models, the characterization of industrial solid materials and the fundamental understanding of crystal dissolution.

Pore-Scale Controls on Calcite Dissolution Rates from Flow-through Laboratory and Numerical Experiments

2014 ◽  
Vol 48 (13) ◽  
pp. 7453-7460 ◽  
Author(s):  
Sergi Molins ◽  
David Trebotich ◽  
Li Yang ◽  
Jonathan B. Ajo-Franklin ◽  
Terry J. Ligocki ◽  
...  
Keyword(s):  
Numerical Experiments ◽  
Pore Scale ◽  
Dissolution Rates ◽  
Calcite Dissolution ◽  
Flow Through

scholarly journals The contribution of hydrodynamic processes to calcite dissolution rates and rate spectra

2021 ◽  
Author(s):  
Priyanka Agrawal ◽  
Till Bollermann ◽  
Amir Raoof ◽  
Oleg Iliev ◽  
Cornelius Fischer ◽  
...  
Keyword(s):  
Dissolution Rates ◽  
Calcite Dissolution ◽  
Hydrodynamic Processes

Effects of the Biologically Produced Polymer Alginic Acid on Macroscopic and Microscopic Calcite Dissolution Rates

2004 ◽  
Vol 38 (11) ◽  
pp. 3040-3046 ◽  
Author(s):  
Perry ◽  
Owen W. Duckworth ◽  
Christopher J. McNamara ◽  
Scot T. Martin ◽  
Ralph Mitchell
Keyword(s):  
Alginic Acid ◽  
Dissolution Rates ◽  
Calcite Dissolution

Influence ofBacillus subtilisCell Walls and EDTA on Calcite Dissolution Rates and Crystal Surface Features

2003 ◽  
Vol 37 (11) ◽  
pp. 2376-2382 ◽  
Author(s):  
A. K. Friis ◽  
T. A. Davis ◽  
M. M. Figueira ◽  
J. Paquette ◽  
A. Mucci
Keyword(s):  
Crystal Surface ◽  
Dissolution Rates ◽  
Calcite Dissolution ◽  
Surface Features

Calcite dissolution rates in texturally diverse calcareous rocks

2014 ◽  
Vol 406 (1) ◽  
pp. 81-94 ◽  
Author(s):  
Yael Levenson ◽  
May Schiller ◽  
Yevgeny Kreisserman ◽  
Simon Emmanuel
Keyword(s):  
Dissolution Rates ◽  
Calcite Dissolution

Mixed kinetic control of calcite dissolution rates

1983 ◽  
Vol 283 (8) ◽  
pp. 815-830 ◽  
Author(s):  
D. Rickard ◽  
E. L. Sjoeberg
Keyword(s):  
Kinetic Control ◽  
Dissolution Rates ◽  
Calcite Dissolution
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