Majzlan J., 2017: Solution calorimetry on minerals related to acid mine drainage – methodology, checks, and balances. Acta Geologica Slovaca, 9, 2, 171–183.
Solution calorimetry on minerals related to acid mine drainage – methodology, checks, and balances
Juraj Majzlan
Institute of Geosciences, Carl-Zeiss-Promenade 10, Friedrich-Schiller University, D-07745 Jena, Germany
Abstract
Solution calorimetry is an established technique to measure thermodynamic properties of solids. Two common options for the solvents and measurement regimes include acid-solution calorimetry with aqueous solvents at temperatures between 0–100 C and high temperature oxide-melt calorimetry, with oxide solvents at 700–1000 C. The usual outcome of a set of solution calorimetry experiments is the enthalpy of formation of a phase studied, calculated from a thermochemical cycle with a set of reference phases. Thermochemical cycles apply the Hess’ law in a form of linear equations. In this paper, the choice and pitfalls of various reference phases is discussed, with a focus on oxysalts (oxides, sulfates, arsenates) related to acid mine drainage. The accuracy and precision in the systems H2O and Fe2O3-H2O is documented by a number of control thermochemical cycles, summarized in this work. Calorimetry on systems including Ca, Cu, Al, As, Sb, Na, and K is also deliberated. For As, X-ray absorption spectroscopy showed that the final oxidation state of arsenic is identical irrespective of the initial oxidation state. In general, the statistical uncertainty of the calorimetric experiments is smaller than the precision of the data, as judged from enthalpies of various reactions. The accuracy of the data, however, does not suffer with due care. Hence, solution calorimetry, with its advantages and disadvantages, is an important method that delivers high-quality thermodynamic data.
Key words: calorimetry, thermodynamics, enthalpies of formation, mine drainage
Manuscript received: 2017-05-29
Revised version accepted: 2017-07-17
Information
Forthcoming articles
AGEOS 2023, Vol. 15, Issue 2
- Lačný A., Lánczos T., Hók J., Józsa Š., Rybárik M., Blaškovič B. & Pachinger P.: Geology, morphology, and speleothems of the Jaskyňa Dezidera Horváta Cave (Western Carpathians)
- Krčmář D., Hodasová K., Ondrejková I. & Fľaková R.: The thermal footprint of urbanization: Linking high-density basement structures to groundwater heat contamination
- Hodasová K., Krčmář D., Zatlakovič M. & Ondrejková I.: Drought hazard assessment using GIS techniques in the Banská Bystrica region
- Aubrecht R.: Palaeokarst clefts and their filling at the type locality of the Honce Limestone (Turňa Unit): Petrographic analysis and its preliminary interpretation
- Pivko D.: The boom-and-bust cycles of the Spiš travertine extraction during nine centuries (northeastern Slovakia)
Archive
- AGEOS 2023, Vol. 15, Issue 1
- AGEOS 2022, Vol. 14, Issue 2
- AGEOS 2022, Vol. 14, Issue 1
- AGEOS 2021, Vol. 13, Issue 2
- AGEOS 2021, Vol. 13, Issue 1
- AGEOS 2020, Vol. 12, Issue 2
- AGEOS 2020, Vol. 12, Issue 1
- AGEOS 2019, Vol. 11, Issue 2
- AGEOS 2019, Vol. 11, Issue 1
- AGEOS 2018, Vol. 10, Issue 2
- AGEOS 2018, Vol. 10, Issue 1
- AGEOS 2017, Vol. 9, Issue 2
- AGEOS 2017, Vol. 9, Issue 1
- AGEOS 2016, Vol. 8, Issue 2
- AGEOS 2016, Vol. 8, Issue 1
- AGEOS 2015, Vol. 7, Issue 2
- AGEOS 2015, Vol. 7, Issue 1
- AGEOS 2014, Vol. 6, Issue 2
- AGEOS 2014, Vol. 6, Issue 1
- AGEOS 2013, Vol. 5, Issue 2
- AGEOS 2013, Vol. 5, Issue 1
- AGEOS 2012, monograph
- AGEOS 2012, Vol. 4, Issue 2
- AGEOS 2012, Vol. 4, Issue 1
- AGEOS 2011, Vol. 3, Issue 2
- AGEOS 2011, Vol. 3, Issue 1
- AGEOS 2010, Vol. 2, Issue 2
- AGEOS 2010, Vol. 2, Issue 1
- AGEOS 2009, Vol. 1, Issue 2
- AGEOS 2009, Vol. 1, Issue 1