『Abstract
Consideration of alkali-feldspar dissolution rates taken from
the literature suggests that in the absence of organic ligands
and at far from equilibrium conditions they can be represented
by r + = k
(aH+3/aAl+3)n,
where r + refers
to the far from equilibrium dissolution rate, k designates
a rate constant, ai stands for the activity
of the subscripted aqueous species, and n refers to a stoichiometric
coefficient. Dissolution rates of these minerals have also been
observed to increase substantially with increasing aqueous organic
acid concentration. To assess if this latter effect is the result
of either the change in aqueous aluminum activity due to aqueous
aluminum-organic acid anion complex formation or organic acid
anion adsorption to the mineral surface, dissolution rates predicted
using the above equation are compared to measured alkali feldspar
dissolution rates. A close correspondence between these predictions
and the experimental data are found, providing strong evidence
that organic acid anion adsorption does not affect alkali-feldspar
dissolution rates.
Keywords: Organic acid absorption; Alkali-feldspar dissolution
rates 』
1. Introduction
2. Theoretical background
3. Computational results and discussion
4. Conclusions
Acknowledgements
References