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Environmental Geology

, Volume 52, Issue 7, pp 1343–1363 | Cite as

Prediction of the thermodynamic properties of metal–arsenate and metal–arsenite aqueous complexes to high temperatures and pressures and some geological consequences

  • Luigi Marini
  • Marina Accornero
Original Article
First Online:
Received:
Accepted:

Abstract

The standard thermodynamic properties at 25°C, 1 bar (ΔG f o , ΔH f o , S o, C P o , V o, ω) and the coefficients of the revised Helgeson–Kirkham–Flowers equations of state were evaluated for several aqueous complexes formed by dissolved metals and either arsenate or arsenite ions. The guidelines of Shock and Helgeson (Geochim Cosmochim Acta 52:2009–2036, 1988) and Sverjensky et al. (Geochim Cosmochim Acta 61:1359–1412, 1997) were followed and corroborated with alternative approaches, whenever possible. The SUPCRT92 computer code was used to generate the log K of the destruction reactions of these metal–arsenate and metal–arsenite aqueous complexes at pressures and temperatures required by the EQ3/6 software package, version 7.2b. Apart from the AlAsO 4 o and FeAsO 4 o complexes, our log K at 25°C, 1 bar are in fair agreement with those of Whiting (MS Thesis, Colorado School of Mines, Golden, CO, 1992). Moreover, the equilibrium constants evaluated in this study are in good to fair agreement with those determined experimentally for the Ca–dihydroarsenate and Ca–hydroarsenate complexes at 40°C (Mironov et al., Russ J Inorg Chem 40:1690, 1995) and for Fe(III)–hydroarsenate complex at 25°C (Raposo et al., J Sol Chem 35:79–94, 2006), whereas the disagreement with the log K measured for the Ca–arsenate complex at 40°C (Mironov et al., Russ J Inorg Chem 40:1690, 1995) might be due to uncertainties in this measured value. The implications of aqueous complexing between dissolved metals and arsenate/arsenite ions were investigated for seawater, high-temperature geothermal liquids and acid mine drainage and aqueous solutions deriving from mixing of acid mine waters and surface waters.

Keywords

Acid Mine Drainage Aqueous Complex Isobaric Heat Capacity Acid Mine Water Standard Partial Molal Volume 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Supplementary material

254_2006_578_MOESM1_ESM.dat.
Supplementary Table 1 (DAT 50 kb)
254_2006_578_MOESM2_ESM.dat.
Supplementary Table 2 (DAT 18 kb)

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Authors and Affiliations

  1. 1.Laboratory of Geochemistry, Dip. Te. RisUniversity of GenovaGenovaItaly

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