Thermal stability of the ‘cave’ mineral brushite CaHPO4•2H2O -mechanism of formation and decomposition
Frost, Ray L. & Palmer, Sara J. (2011) Thermal stability of the ‘cave’ mineral brushite CaHPO4•2H2O -mechanism of formation and decomposition. Thermochimica Acta, 521(1-2), pp. 14-17.
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Abstract
Thermogravimetry combined with evolved gas mass spectrometry has been used to ascertain the stability of the ‘cave’ mineral brushite. X-ray diffraction shows that brushite from the Jenolan Caves is very pure. Thermogravimetric analysis coupled with ion current mass spectrometry shows a mass loss at 111°C due to loss of water of hydration. A further decomposition step occurs at 190°C with the conversion of hydrogen phosphate to a mixture of calcium ortho-phosphate and calcium pyrophosphate. TG-DTG shows the mineral is not stable above 111°C. A mechanism for the formation of brushite on calcite surfaces is proposed, and this mechanism has relevance to the formation of brushite in urinary tracts.
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| ID Code: | 42191 |
|---|---|
| Item Type: | Journal Article |
| Additional Information: | This is the work of student Sara Palmer |
| Keywords: | thermogravimetry, urinary calculi, brushite, phosphate, kidney stones |
| DOI: | 10.1016/j.tca.2011.03.035 |
| ISSN: | 00406031 |
| Subjects: | Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606) |
| Divisions: | Past > Schools > Chemistry Past > QUT Faculties & Divisions > Faculty of Science and Technology |
| Copyright Owner: | Copyright 2011 Elsevier |
| Deposited On: | 28 Jun 2011 09:28 |
| Last Modified: | 28 Jun 2011 09:28 |
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