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Solubility and thermodynamic data for metal arsenates

Königsberger, E., Majzlan, M. and Nordstrom, D.K. (2014) Solubility and thermodynamic data for metal arsenates. In: 16th International Symposium on Solubility Phenomena and Related Equilibrium Processes, 21 - 25 July, Karlsruhe, Germany


Reliable and consistent thermodynamic data for arsenic minerals and aqueous species are required given the worldwide recognition of As poisoning in more than 70 countries [1] and the need to model As mobility more quantitatively in groundwater systems. Arsenic contamination can also constitute a serious problem in hydrometallurgical processing [2]. Unfortunately, few useful thermodynamic measurements have been made on reactions involving As minerals because of experimental difficulties, including long equilibration times with aqueous solutions, formation of metastable phases, and effects of crystallinity and particle-size on solubilities [3].

Solutions to these impediments are discussed in this review of solubility and thermodynamic data for Fe(III) [4] and Ca arsenates, and for solid solutions of arsenates with phosphates and vanadates [5]. We will present models for solubility calculations that utilize the most recent critical evaluation of the thermodynamic properties of arsenic species [6]. We will also make recommendations for the resolution of some discrepancies and suggest directions for further investigations.

Publication Type: Conference Paper
Murdoch Affiliation: School of Engineering and Information Technology
Conference Website:
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