Synchrotron radiation Ca K-edge 2D-XANES spectroscopy for studying the stratigraphic distribution of calcium-based consolidants applied in limestones

In Heritage Science, the evaluation of stone consolidation treatments by investigating the nature of in situ newly formed products and their penetration depth within the consolidated matrix is a grand challenge. A number of analytical methods have been proposed, but, currently, most of them are not...

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Vydané v:Scientific reports Ročník 10; číslo 1; s. 14337 - 14
Hlavní autori: Monico, Letizia, Cartechini, Laura, Rosi, Francesca, De Nolf, Wout, Cotte, Marine, Vivani, Riccardo, Maurich, Celeste, Miliani, Costanza
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: London Nature Publishing Group UK 31.08.2020
Nature Publishing Group
Nature Portfolio
Predmet:
639/301
639/301/930/12
639/301/930/2735
639/638/11
639/638/11/942
Calcite
Calcium carbonate
Carbonates
Chemical Sciences
Community structure
Ecosystems
Emission spectroscopy
Grasslands
Grazing
Humanities and Social Sciences
Limestone
multidisciplinary
Science
Science (multidisciplinary)
Species richness
Steppes
Vegetation
Vegetation type
X-ray fluorescence
ISSN:2045-2322, 2045-2322
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Popis
Shrnutí:In Heritage Science, the evaluation of stone consolidation treatments by investigating the nature of in situ newly formed products and their penetration depth within the consolidated matrix is a grand challenge. A number of analytical methods have been proposed, but, currently, most of them are not able to supply a full overview of the spatial, structural and compositional information of the newly formed crystalline and amorphous phases with a submicrometric lateral resolution. Here, we examined, the capabilities of synchrotron radiation (SR)-based two-dimensional X-ray absorption near-edge structure (2D-XANES) spectroscopy at Ca K-edge for determining the structural and compositional properties of the compounds formed after the application of a calcium acetoacetate-based consolidant on a porous carbonatic stone (limestone) and for investigating their stratigraphic distribution at the submicrometric scale length. We evaluated advantages and drawbacks of three Ca K-edge 2D-XANES-based approaches: (i) transmission mode full-field-XANES (FF-XANES) imaging; (ii) micro-X-ray fluorescence (μ-XRF) mapping above the Ca K-edge combined with the acquisition of XRF mode μ-XANES spectra at a limited number of spots; (iii) full-spectral µ-XANES (FS µ-XANES) mapping in XRF mode and its variant called selectively induced X-ray emission spectroscopy (SIXES) mapping. Overall, Ca K-edge 2D-XANES spectroscopy provided accurate qualitative and semi-quantitative information on the newly formed calcium carbonates (i.e., amorphous calcium carbonate, vaterite and calcite) and their stratigraphic distribution at the submicrometric scale, thus opening a new scenario to study the carbonatation process of calcium-based consolidants in limestones.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-71105-8