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Solubility

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Related Experiment Video

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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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Effect of solution saturation state and temperature on diopside dissolution.

Suvasis Dixit¹, Susan A Carroll

¹Atmospheric, Earth, and Energy Department, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. dixit2@llnl.gov

Geochemical Transactions

|March 28, 2007

Summary

Diopside dissolution rates decrease significantly with increasing saturation, explained by ion exchange or pit nucleation models. A secondary phase precipitated at 175°C, affecting dissolution predictions.

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Area of Science:

Geochemistry
Mineralogy
Chemical Kinetics

Background:

Understanding mineral dissolution is crucial for geochemical processes and material science.
Diopside dissolution rates are influenced by solution chemistry and temperature.
Previous models often simplify the complex surface reactions involved in mineral dissolution.

Purpose of the Study:

To quantify steady-state dissolution rates of diopside as a function of solution saturation.
To evaluate the applicability of ion exchange and pit nucleation models to diopside dissolution.
To investigate the influence of temperature on diopside dissolution kinetics.

Main Methods:

Experiments conducted in a titanium flow-through reactor at controlled pH (7.5) and temperatures (125-175°C).
Measurement of diopside dissolution rates across a range of solution saturation states.
Application of transition state theory (ion exchange model) and crystal growth/dissolution theory (pit nucleation model) for data analysis.

Main Results:

Diopside dissolved stoichiometrically, with rates decreasing by two orders of magnitude as equilibrium approached.
Both ion exchange and pit nucleation models described the data well, but overpredicted rates at 175°C due to secondary phase precipitation.
Mg-H exchange was identified as a key mechanism in the ion exchange model, with derived kinetic parameters.
Pit nucleation model indicated homogeneous nucleation occurred at lower saturation than defect-assisted nucleation, with distinct step edge energies and activation energies.

Conclusions:

Diopside dissolution is controlled by surface reaction mechanisms, well-represented by ion exchange or pit nucleation models.
Secondary phase precipitation at higher temperatures complicates dissolution rate predictions.
The study provides quantitative insights into diopside surface reactivity and dissolution pathways.