Total dynamics of quartz-water system at ambient conditions

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Authors	FAIMON Jiří
Year of publication	2005
Type	Article in Periodical
Magazine / Source	Aquatic Geochemistry
MU Faculty or unit	Faculty of Science
Citation
Field	Geochemistry
Keywords	complex; dissolution; dynamics; flux; growth; modeling; PHREEQC; quartz; surface
Description	New data on the dissolution and growth of quartz in acid, nearly neutral and slightly alkaline solutions at ambient conditions are presented. During batch dissolutions, aqueous Si-concentrations increased nonlinearly towards limit values. During parallel growth experiments, however, the high Si-concentrations corresponding to 13-fold supersaturation with respect to quartz did not decreased. To interpret these results, two dynamic models (1) a reaction model and (2) a surface-complexation model, were derived. Both models were focused on (a) reversible dissolution/growth of bulk quartz and b) irreversible dissolution of disturbed quartz (weakly bounded Si-atoms) on new surface.
Related projects:	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)