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dc.contributor.authorMarcaida Ormazabal, Iker
dc.contributor.authorMaguregui Hernando, Maite
dc.contributor.authorMorillas Loroño, Héctor
dc.contributor.authorPérez Díez, Silvia
dc.contributor.authorMadariaga Mota, Juan Manuel
dc.date.accessioned2019-11-28T15:29:39Z
dc.date.available2019-11-28T15:29:39Z
dc.date.issued2019-11-07
dc.identifier.citationAnalytical and Bioanalytical Chemistry 411(28) : 7585-7593 (2019)es_ES
dc.identifier.issn1618-2642
dc.identifier.urihttp://hdl.handle.net/10810/36617
dc.description.abstractMost of the wall paintings from Pompeii are decorated with red and yellow colors but the thermal impact of 79 AD MountVesuvius eruption promoted the partial transformation of some yellow-painted areas into red. The aim of this research is todevelop a quantitative Raman imaging methodology to relate the transformation percentage of yellow ochre (goethite,α-FeOOH) into red color (hematite,α-Fe2O3) depending on the temperature, in order to apply it and estimate the temperature atwhich the pyroclastic flow impacted the walls of Pompeii. To model the thermal impact that took place in the year 79 AD, ninewall painting fragments recovered in the archeological site of Pompeii and which include yellow ochre pigment were subjected tothermal ageing experiments (exposition to temperatures from 200 to 400 °C every 25 °C). Before the experiments, elementalinformation of the fragments was obtained by micro-energy dispersive X-ray fluorescence (μ-ED-XRF). The fragments werecharacterized before and after the exposition using Raman microscopy to monitor the transformation degree from yellow to red.The quantitative Raman imaging methodology was developed and validated using synthetic pellets of goethite and hematitestandards. The results showed almost no transformation (0.5% ± 0.4) at 200 °C. However, at 225 °C, some color transformation(26.9% ± 2.8) was observed. The most remarkable color change was detected at temperatures between 250 °C (transformation of46.7% ± 1.7) and 275 °C (transformation of 101.1% ± 1.2). At this last temperature, the transformation is totally completed sincefrom 275 to 400 °C the transformation percentage remained constant.es_ES
dc.description.sponsorshipThis work has been funded by the Spanish Agency for Research AEI (MINECO-FEDER/UE) through the project MADyLIN (BIA2017-87063-P). Iker Marcaida received funding from Basque Government for his predoctoral fellowship. The research leading to these results has also received funding from “la Caixa” Foundation (Silvia Pérez-Diez, ID100010434, Fellowship code LCF/BQ/ES18/11670017).es_ES
dc.language.isoenges_ES
dc.publisherSpringeres_ES
dc.relationinfo:eu-repo/grantAgreement/MINECO/BIA2017-87063-Pes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectyellow ochrees_ES
dc.subjectdehydratioes_ES
dc.subjectRaman imaginges_ES
dc.subjectcolor transformationes_ES
dc.subjectquantitative analysises_ES
dc.titleRaman imaging to quantify the thermal transformation degree of Pompeian yellow ochre caused by the 79 AD Mount Vesuvius eruptiones_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.holder© Springer-Verlag GmbH Germany, part of Springer Nature 2019es_ES
dc.relation.publisherversionhttps://link.springer.com/article/10.1007%2Fs00216-019-02175-5es_ES
dc.identifier.doi10.1007/s00216-019-02175-5
dc.departamentoesQuímica analíticaes_ES
dc.departamentoeuKimika analitikoaes_ES


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