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Título

Thermal decomposition and X-ray diffraction of sulphate efflorescent minerals from El Jaroso Ravine, Sierra Almagrera, Spain

AutorFrost, Ray L.; Wain, Daria; Martens, Wayde N.; Locke, Ashley C.; Martínez-Frías, J.; Rull, Fernando
Palabras claveEvaporite
Jarosite
Sulphate
Dehydration
Dehydroxylation
Halotrichite
TG–MS
High-resolution thermogravimetric analysis
Fecha de publicación22-may-2007
EditorElsevier
CitaciónThermochimica Acta 460(1-2): 9-14 (2007)
ResumenTwo evaporite minerals from the El Jaroso Ravine, Spain have been analysed by thermogravimetry coupled with an evolved gas mass spectrometer. X-ray diffraction results proved the evaporite minerals were a mixture of sulphates including the minerals magnesiocopiapite, coquimbite and possibly alunogen. Thermal decomposition of the unoxidised samples showed steps at 52, 99 and 143 °C confirmed by mass spectrometric results and attributed to adsorbed water, interstitial water and chemically bonded water. This evaporite mineral rock showed two higher temperature decomposition steps at 555 and 599 °C with mass losses of 19.6 and 7.8%. Slightly different temperatures for the thermal decomposition of the oxadada sample were observed at 52, 64.5 and 100 °C. Two higher temperature mass loss steps at 560.5 and 651 °C were observed for the oxidised sample. By comparison of the thermal analysis patterns of halotrichite and jarosite it can be shown that the El Jaroso samples are mineral sulphates and not halotrichite or jarosite.
Descripción6 páginas, 7 figuras.-- El PDF del artículo esta en formato pre-print.
Versión del editorhttp://dx.doi.org/10.1016/j.tca.2007.05.011
URIhttp://hdl.handle.net/10261/13310
DOI10.1016/j.tca.2007.05.011
ISSN0040-6031
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