Thermal decomposition of hydronium jarosite (H3O)Fe3 (SO4)2 (OH)6
Frost, Ray L., Wills, Rachael-Anne, Kloprogge, J. Theo, & Martens, Wayde N. (2006) Thermal decomposition of hydronium jarosite (H3O)Fe3 (SO4)2 (OH)6. Journal of thermal Analysis and Calorimetry, 83(1), pp. 213-218.
Thermogravimetry combined with mass spectrometry has been used to study the thermal decomposition of a synthetic hydronium jarosite. Five mass loss steps are observed at 262 294, 385, 557 and 619 degrees Celsius. The mass loss step at 557 degrees Celsius is sharp and marks a sharp loss of sulphate as SO3 from the hydronium jarosite. Mass spectrometry through evolved gases confirms the first three mass loss steps to dehydroxylation, the fourth to a mass loss of the hydrated proton and a sulphate and the final step to the loss of the remaining sulphate. Changes in the molecular structure of the hydronium jarosite were followed by infrared emission spectroscopy. This technique allows the infrared spectrum at the elevated temperatures to be obtained. Infrared emission spectroscopy confirms the dehydroxylation has taken place by 400 degrees Celsius and the sulphate loss by 650 degrees Celsius. Jarosites are a group of minerals formed in evaporite deposits and form a component of the efflorescence. The minerals can function as cation and heavy metal collectors. Hydronium jarosite has the potential to act as a cation collector by the replacement of the proton with a heavy metal cation.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
|Item Type:||Journal Article|
|Additional Information:||This manuscript is one of a series of papers on the characterisation of jarosites including their thermal stability. Interest in such minerals stems from the possibility of their existence on Mars. such minerals are only formed from solutions.|
|Keywords:||jarosite, hydronium jarosite, dehydration, dehydroxylation, infrared emission spectroscopy, high, resolution thermogravimetric analysis|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2006 Springer|
|Copyright Statement:||The original publication is available at SpringerLink
|Deposited On:||21 Mar 2006 00:00|
|Last Modified:||29 Feb 2012 13:15|
Repository Staff Only: item control page