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Estimation of the Standard Free Energy of Formation of Metal Arsenates, Selenates, and Selenites

Div. of Waste Characterization and Chemistry, Western Research Inst., Univ. of Wyoming Research Corporation, P.O. Box 3395, Laramie, WY 82071

*Corresponding author.

ABSTRACT

An empirical method developed for estimating the standard free energy of formation (G°_f) of solid phases is evaluated for metal arsenates, selenates, and selenites. A free energy function of a solid phase is found to be linearly correlated to a function of the metal oxide G°_f and the aqueous metal ion G°_f for the compound groups examined. The values estimated by this method are, on average, within ± 10.9, 10.4, and 12.0 kJ mol^–1 of the experimental arsenate, selenate, and selenite values, respectively. A method for estimating the G°_f of hydrated metal arsenates and selenites is also evaluated. The estimated standard free energy of formation values of hydrated arsenates and selenites, on average, are within ± 23.7 and 10.0 kJ mol^–1, respectively, of the observed values. The error involved in estimating metal arsenate, selenate, and selenite G°_f values are comparable to those obtained when the estimation technique was applied to other compound types.

Contribution of the Div. of Waste Characterization and Chemistry.

Received for publication January 7, 1988.

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