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Effects of pH, temperature, and aqueous organic material on the dissolution kinetics of meta-autunite minerals, (Na, Ca)~2−1~[(UO~2~)(PO~4~)]~2~· 3H~2~O by Dawn M. Wellman; Jonathan P. Icenhower; Amy P. Gamerdinger; Steven W. Forrester is a Earth and Planetary Sciences article available to read on EtoBox.

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Autunite-group minerals have been frequently identiÞ ed in contaminated sediments as the long-term controlling phase of U. Under these conditions, the mobility of U in subsurface pore waters is limited by the rate of dissolution of autunite and meta-autunite group minerals, , where X = Ca or Na. Single-pass ß ow-through (SPFT) tests were conducted to quantify the dissolution kinetics of natural Ca meta-autunite, Ca[(UO 2 )(PO 4 )] 2 ⋅3H 2 O, and synthetic Na meta-autunite, Na 2 [(UO 2 )(PO 4 )] 2 ⋅3H 2 O, as a function of pH (7-10) and temperature (5-70 °C) in the presence and absence of aqueous organic material. The data indicate that release of U and P are non-stoichiometric over the range of experimental conditions investigated. In a 0.1 M NH 4 OH buffer solution, acquisition of valid dissolution rate data was limited by uramphite solubility, NH 4 [(UO 2 )(PO 4 )] 2 •xH 2 O. Dissolution rates obtained in a 0.01 M TRIS [tris (hydroxymethyl) aminomethane] buffered solution increased by a factor of ~100× over the pH interval of 7 to 10 (η = 0.90 ± 0.08), irrespective of temperature. At constant pH the rate data showed a minor increase with temperature. Data from experiments using a

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Author

Dawn M. Wellman; Jonathan P. Icenhower; Amy P. Gamerdinger; Steven W. Forrester

Publisher

Mineralogical Society of America

Published

2006

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)