Solubility of mimetite Pb5(AsO4)3Cl at 5–55°C

Tomasz Bajda

doi:10.1071/EN10021

RESEARCH ARTICLE

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Solubility of mimetite Pb₅(AsO₄)₃Cl at 5–55°C

Tomasz Bajda

+ Author Affiliations

- Author Affiliations

Department of Mineralogy, Petrography and Geochemistry, Faculty of Geology, Geophysics and Environment Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland. Email: bajda@geol.agh.edu.pl

Environmental Chemistry 7(3) 268-278 https://doi.org/10.1071/EN10021
Submitted: 9 March 2010 Accepted: 24 April 2010 Published: 2 May 2010

Environmetal context. The mobility of toxic arsenic compounds in the environment can be controlled by the solubility of certain minerals. To predict and model the fate and behaviour of these contaminants, the solubility and related thermodynamic properties of the lead and arsenic mineral mimetite were determined. The data obtained in this study will be used to optimise and increase the effectiveness of remediation procedures that are already applied to contaminated sites.

Abstract. The solubility of the synthesised mimetite was measured in a series of dissolution experiments at 5–55°C and at pH values between 2.00 and 2.75. The solubility product logK_SP for the reaction Pb₅(AsO₄)₃Cl ↔ 5Pb²⁺ + 3AsO₄^3– + Cl^– at 25°C is –76.35 ± 1.01. The free energy of formation ΔG_f,298⁰ calculated from this measured solubility product equals –2634.3 ± 5.9 kJ mol^–1. The temperature dependence of the logK_SP is non-linear, indicating that the enthalpy of the reaction depends on the temperature. The enthalpy of the formation of mimetite ΔH_f⁰, is –2965.9 ± 4.7 kJ mol^–1, the entropy, ΔS⁰, is 39.5 J mol^–1 K^–1, and the heat capacity, ΔC_p,f⁰ is –6172 ± 105 J mol^–1 K^–1. Hydrochemical modelling indicates that regardless of the composition of the background solution, Pb₅(AsO₄)₃Cl is most stable at neutral to weakly alkaline pH.

Additional keywords: arsenic, dissolution, lead, synthesis, thermodynamic properties.

Acknowledgements

I thank Maciej Manecki (AGH-UST) for help with calculations, fruitful discussions and for his comments on an earlier version of this manuscript. Marek Sikora, Adam Gaweł, Włodzimierz Mozgawa (all from AGH UST) are thanked for their assistances with AAS, XRD, and FTIR analyses respectively. I greatly appreciate the comments of the reviewers, which helped to improve the manuscript. This work was supported by the Ministry of Science and Higher Education as AGH UST grant no. 10.10.140.681 from the University of Science and Technology.

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Solubility of mimetite Pb5(AsO4)3Cl at 5–55°C

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Solubility of mimetite Pb₅(AsO₄)₃Cl at 5–55°C