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Mineralogia

The Journal of Mineralogical Society of Poland

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1899-8526
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Synthesis and solubility of brompyromorphite Pb5(PO4)3Br

Urszula Janicka
  • AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30–059 Krakow, Poland
  • Other articles by this author:
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/ Tomasz Bajda
  • Corresponding author
  • AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30–059 Krakow, Poland
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Maciej Manecki
  • AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30–059 Krakow, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2013-05-28 | DOI: https://doi.org/10.2478/v10002-012-0004-4

Abstract

The bromide analogue of pyromorphite Pb5(PO4)3Br was synthesized and characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The solubility of the brompyromorphite was measured at 25°C and pH values of 2.0, 2.6 and 3.2. For the 3 pH measurements, the average solubility product, log KSP, for the reaction Pb5(PO4)3Br ⇔ 5Pb2+ + 3PO- 3- + Br- at 25ºC is -77.38 ± 0.70. The free energy of formation, ΔG°f,298, calculated from this measured solubility product is -3724.7 ± 4.3 kJ mol−1. These results confirm that brompyromorphite is more soluble than pyromorphite.

Keywords: lead; phosphate; apatite; dissolution; brompyromorphite; solubility product

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About the article

Published Online: 2013-05-28

Published in Print: 2012-03-01


Citation Information: Mineralogia Polonica, ISSN (Online) 1899-8526, ISSN (Print) 1899-8291, DOI: https://doi.org/10.2478/v10002-012-0004-4.

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