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dc.contributor.authorCunha, Camila Cristina Rodrigues Ferreira da-
dc.contributor.authorCosta, Geraldo Magela da-
dc.date.accessioned2019-05-03T15:27:09Z-
dc.date.available2019-05-03T15:27:09Z-
dc.date.issued2016-
dc.identifier.citationCUNHA, C. C. R. F. da; COSTA, G. M. da. Water determination in iron oxyhydroxides and iron ores by Karl Fischer titration. Physics and Chemistry of Minerals, v. 43, n. 10, p. 739–748, nov. 2016. Disponível em: <https://link.springer.com/article/10.1007/s00269-016-0830-9>. Acesso em: 7 mar. 2019.pt_BR
dc.identifier.issn1432-2021-
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/11186-
dc.description.abstractProtohematite (Fe2−x/3(OH) x O3−x 1 ≤ x < 0.5) and hydrohematite (Fe2−x/3(OH) x O3−x 0.5 ≤ x < 0) are iron-defective phases containing hydroxyl groups in their structures. These species were described in prior studies mainly with the aid of X-ray diffraction and Infrared spectroscopy. The existence of these phases in soils might have influence in redox processes, and they were considered as a possible water reservoir in Martian soils. In this study, we have used for the first time the Karl Fischer titration method to determine the amount of water released after heating several synthetic samples of goethite, hematite and natural iron ores at 105, 400, 600 and 900 °C. It was found that heating at 105 °C did not remove all moisture from the samples, and higher temperatures were necessary to completely remove all the absorbed water. The water contents determined at 400, 600 and 900 °C were found to be the same within the experimental errors, suggesting the inexistence of both protohematite and hydrohematite in the investigated samples. Therefore, the above-mentioned effects of these phases in soils might have to be reevaluated.pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectWater contentpt_BR
dc.subjectHematitept_BR
dc.subjectProtohematitept_BR
dc.subjectHydrohematitept_BR
dc.titleWater determination in iron oxyhydroxides and iron ores by Karl Fischer titration.pt_BR
dc.typeArtigo publicado em periodicopt_BR
dc.identifier.uri2https://link.springer.com/article/10.1007%2Fs00269-016-0830-9pt_BR
dc.identifier.doihttp://doi.org/10.1007/s00269-016-0830-9pt_BR
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