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Vol. 27 No. 2 (2015): Vol 27 Issue 2

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Dissolution and Stability of Arsenate/Phosphate Fluorapatite Solid Solution [Ca5(PxAs1-xO4)3F] in Aqueous Solution at 25 degree C

https://doi.org/10.14233/ajchem.2015.17011
Huan Deng
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, P.R. China; College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China
Lingyun Mo
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China
Yinian Zhu
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China
Zongqiang Zhu
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China*Corresponding authors: Fax: +86 773 5895330; Tel: +86 773 5891059; E-mail: molingyun123@126.com; zhuyinian@163.com
Huili Liu
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China
Na He
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China
Jie Liu
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, P.R. China

Corresponding Author(s) : Lingyun Mo

molingyun123@126.com

Asian Journal of Chemistry, Vol. 27 No. 2 (2015): Vol 27 Issue 2

Abstract

Arsenate/phosphate fluorapatite solid solutions [Ca5(PxAs1-xO4)3F] were synthesized and characterized and then their dissolution was studied at pH 2 at 25 °C. During the dissolution, the aqueous pH and Ca2+ increased quickly at the early stage and achieved a steady state after 48 h. The aqueous F– and PO43– concentrations increased rapidly and achieved a peak value in 1-3 h and then decreased slowly and showed stable after 200-400 h. With the decreasing mole fraction of Ca5(PO4)3F in the solid, the aqueous pH, Ca2+, F– and AsO43– concentrations increased, while the aqueous PO43– concentrations decreased. The F– anion was found to dissolve preferentially and the release of Ca2+ was always more in comparison with the release of PO43– and AsO43–. The dissolution of the phosphate-rich solids followed the Lippmann solutus curve, the dissolution of the arsenate-rich precipitates either followed or slightly overshot the Lippmann solutus curve, then approached the solutus curve.

Keywords

Apatite group Arsenic Fluorine Lippmann diagram Dissolution path
Deng, H., Mo, L., Zhu, Y., Zhu, Z., Liu, H., He, N., & Liu, J. (2015). Dissolution and Stability of Arsenate/Phosphate Fluorapatite Solid Solution [Ca5(PxAs1-xO4)3F] in Aqueous Solution at 25 degree C. Asian Journal of Chemistry, 27(2), 521–531. https://doi.org/10.14233/ajchem.2015.17011
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