U.S. Geological Survey
Open-File Report 02-161
Online Version 1.0
By Bruce S. Hemingway, Robert R. Seal, II and I-Ming Chou
Enthalpy of formation, Gibbs energy of formation, and entropy values have been compiled from the literature for the hydrated ferrous sulfate minerals melanterite, rozenite, and szomolnokite, and a variety of other hydrated sulfate compounds. On the basis of this compilation, it appears that there is no evidence for an excess enthalpy of mixing for sulfate-H2O systems, except for the first H2O molecule of crystallization. The enthalpy and Gibbs energy of formation of each H2O molecule of crystallization, except the first, in the iron(II) sulfate - H2O system is -295.15 and -238.0 kJ·mol-1, respectively. The absence of an excess enthalpy of mixing is used as the basis for estimating thermodynamic values for a variety of ferrous, ferric, and mixed-valence sulfate salts of relevance to acid-mine drainage systems.
This report is available in the following formats:
If you wish to save one of these files to disk, right-click (PC) or click and hold (Macintosh). Adobe Acrobat Reader 4.0 (or newer) is necessary to view the .pdf files. If Acrobat Reader 4.0 (or newer) is not installed on your computer, it is available for downloading from the Adobe website.
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only, and does not imply endorsement by the U.S. Government.
Inquiries about this product should be addressed to:
Robert R. Seal
U.S. Geological Survey MS 954
12201 Sunrise Valley Drive
Reston, VA 20192
This open-file report is available from the USGS Information Services. See USGS product and pricing information to purchase this product.
U.S. Department of the Interior, U.S. Geological Survey
Maintained by Publishing Services
Last modified: 03:02:33 Fri 11 Jan 2013
Privacy statement | General disclaimer | Accessibility