Correlating quartz dissolution kinetics in pure water from 25 to 625°C

Details Correlating quartz dissolution kinetics in pure water from 25 to 625°C Correlating quartz dissolution kinetics in pure water from 25 to 625°C

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.2407t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 11, pp.2407-2420

Physics

21

Scientific paper

Results for quartz dissolution kinetics in pure water from five different experimental apparatuses in this study were correlated with measurements from ten previous investigations. A simple global equation with an Arrhenius rate constant formulation satisfactorily represented experimental data spanning temperatures from 25 to 625°C obtained from crushed quartz crystals, quartz sand, and quartz slab samples. Geometric and BET-derived surface areas were successfully used to normalize dissolution rates. An Arrhenius expression describing a kinetic dissolution rate constant with an average activation energy of 89 ± 5 kJ/mol was regressed from the set of dissolution rate data covering eleven orders of magnitude in variation from about 4 × lO -14 mol/m 2 s at 25°C to 1 × 10 -3 mol/m 2 s at 625°C on a geometric area basis.

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