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

Marini, Luigi; Accornero, Marina

doi:10.1007/s00254-006-0578-5

Cited by 65 publications

(28 citation statements)

References 57 publications

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“…Duchesne and Reardon (1995); 14. Marini and Accornero (2007) c Log K f = 20. The predicted concentrations of aqueous As(V) showed a widely varying behavior with pH depending sensibly on the concentrations of the other trace elements.…”

Section: Speciation Diagramsmentioning

confidence: 99%

Natural Arsenic Attenuation via Metal Arsenate Precipitation in Soils Contaminated with Metallurgical Wastes: I. Wet Chemical and Thermodynamic Evidences

et al. 2009

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Arsenic from natural and anthropogenic sources is a worldwide contaminant of aqueous environments, such as groundwater and soils. The present investigation was performed on Mexican soils contaminated with residues from metallurgical processes that have shown a natural As attenuation. Experimental aqueous arsenic extractions in these were successfully simulated for almost half of the soil samples using a database updated for all known metal arsenate formation constants, revealing the predominance of solubility-controlled As mobility via Pb, mixed Pb-Cu, and Ca arsenate solid formation. The relatively low total Fe/As ratios (2-13 w/w) present in the soils studied, together with the high and equivalent contents of As, Pb, and Cu in these, favor the precipitation process over As(V) adsorption to Fe oxides, despite a 2% average Fe content in the soils studied. Under these conditions bicarbonate was found to be a highly unsuitable extractant due to its indirect As release from the solid arsenates, via heavy metal carbonate precipitation processes.

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Section: Speciation Diagramsmentioning

confidence: 99%

Natural Arsenic Attenuation via Metal Arsenate Precipitation in Soils Contaminated with Metallurgical Wastes: I. Wet Chemical and Thermodynamic Evidences

et al. 2009

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“…Langmuir et al (2006) used equilibrium constants obtained by Whiting (1992). Marini and Accornero (2007) independently estimated thermodynamic properties of Fe-bearing arsenate and arsenite aqueous complexes.…”

Section: Internally Consistent Thermodynamic Properties For Arsenicmentioning

confidence: 99%

“…Currently, there is tremendous interest in arsenic geochemistry (Tamaki and Frankenberger 1992;WHO 2001;Nordstrom and Archer 2002;Smedley and Kinniburg 2002;Oremland and Stolz 2003;Swartz et al 2004;Hollibaugh et al 2005;Keimowitz et al 2005;Amirbahman et al 2006;Sverjensky and Fukushi 2006;Fukushi and Sverjensky 2007;Marini and Accornero 2007). Eh-pH diagrams provide a useful guide for evaluating the predominance of dissolved species and stability of solids (Garrels and Christ 1965;Pourbaix 1966;Krauskopf and Bird 1995).…”

Section: Introductionmentioning

confidence: 97%

“…These Eh-pH diagrams differ because (1) different thermodynamic properties for aqueous species and solids are used for construction of Eh-pH diagrams by different authors; (2) inclusion or exclusion of certain arsenic species (e.g., thio-arsenic species and ferric arsenate); and (3) different chemical systems of interest. Since the last special publication of Eh-pH diagrams for arsenic, which was over 10 years ago (Vink 1996), new values of thermodynamic properties for arsenic species have become available through several re-evaluations, compilations, or estimations (Nordstrom and Archer 2002; Pokrovski et al 2002;Langmuir et al 2006;Marini and Accornero 2007). Several previous compilations focused on particular systems of interest.…”

Section: Introductionmentioning

confidence: 98%

“…Several previous compilations focused on particular systems of interest. For example, Nordstrom and Archer (2002) focused on the As-O-H-S system; Langmuir et al (2006) concentrated on the As-O-H-Fe system; Marini and Accornero (2007) focused on thermodynamic properties of metal-arsenate and metalarsenite aqueous complexes; and Root et al (2009) focused on arsenic surface complexation with Fe. In addition, new experimental data for barium arsenate and barium hydrogen arsenate data (Zhu et al 2005) are available.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic Eh–pH diagrams at 25°C and 1 bar

2010

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A thermodynamic dataset for arsenic species in As-O-H-S-Fe-Ba system was compiled from the literature. Using this dataset, Eh-pH diagrams for the systems As-O-H, As-O-H-S, As-O-H-S-Fe, As-O-H-Ba, and As-O-H-S-Fe-Ba were constructed at 25°C and 1 bar. The inclusion of thioarsenite species in the systems As-O-H-S and As-O-H-S-Fe results in substantial differences from previously published Eh-pH diagrams. There are considerable differences in the thermodynamic properties for orpiment, realgar, scorodite, arsenopyrite, barium arsenate, and barium hydrogen arsenate, which result in vastly different stability fields when different values are adopted.

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Thermodynamics, Geochemical Modeling and Related Considerations

Cioni

Marini²

2020

Springer Geochemistry

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

Cited by 65 publications

References 57 publications

Natural Arsenic Attenuation via Metal Arsenate Precipitation in Soils Contaminated with Metallurgical Wastes: I. Wet Chemical and Thermodynamic Evidences

Natural Arsenic Attenuation via Metal Arsenate Precipitation in Soils Contaminated with Metallurgical Wastes: I. Wet Chemical and Thermodynamic Evidences

Arsenic Eh–pH diagrams at 25°C and 1 bar

Thermodynamics, Geochemical Modeling and Related Considerations

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