Abstract
The water activity of the H3AsO4–H2O system is quite important for controlling arsenic in the environment and modeling the hydrometallurgical processing related to arsenic. In this work, the water activity for this binary system, from extremely low concentrations to a molality of 18 mol·kg–1 at 298.15 K was determined by isopiestic measurements. The relative isopiestic molality deviation for parallel samples in each experimental run was better than 0.2%. When these water activity data were combined with the mean ionic activity coefficient (γm,±) calculated by the Gibbs–Duhem equation, the Pitzer model parameters for arsenic acid aqueous solution were fitted. The reliability of the data and the model parameters obtained in this work were also systematically discussed.
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