DOES ORGANIC ACID ADSORPTION AFFECT ALKALI-FELDSPAR DISSOLUTION RATES?

Abstract

Consideration of alkali-feldspar dissolution ratesThe term alkali-feldspar is used in the present study to denote those feldspars that dissolve via aluminum deficient precursor complexes [Oelkers, E.H., Schott, J., Devidal, J.L., 1994. The effect of aluminum, pH, and chemical affinity on the rates of aluminosilicate dissolution reactions. Geochim. Cosmochim. Acta, 58 (1994) 2011-2024.], which includes feldspars in the system NaAlSi3O8-KAlSi3O8, as well as plagioclases of compositions ~An80 or less [Oelkers, E.H., Schott, J., 1995b. Experimental study of anorthite dissolution and the relative mechanism of feldspar hydrolysis. Geochim. Cosmochim. Acta, 59: (1995) 5039-5053].