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Applied Physics A

, Volume 111, Issue 1, pp 109–119 | Cite as

Efficiency of applying ammonium oxalate for protection of monumental limestone by poultice, immersion and brushing methods

  • D. MudronjaEmail author
  • F. Vanmeert
  • K. Hellemans
  • S. Fazinic
  • K. Janssens
  • D. Tibljas
  • M. Rogosic
  • S. Jakovljevic
Article

Abstract

Samples of cretaceous limestone have been treated with three application methods (poultice, immersion and brushing) using different concentrations of ammonium oxalate solution (AmOx) and varying treatment time in order to test the efficiency of surface and in-depth formation of a protective layer of calcium oxalate (CaOx). Synchrotron-based microanalytical techniques (SR-μXRD with 12.5 μm×7.5 μm (H×V) probe size, SR-μFTIR with 10 μm×10 μm and 8 μm×20 μm probe sizes) and laboratory μFTIR, XRD and SEM have been employed for analysis of the treated samples. Synchrotron-based techniques showed variations in the CaOx distribution along the surface on a micrometer scale. All treatments resulted in the development of a CaOx layer with a maximum thickness of approximately 40 μm. Application by the brushing method with 10 1-min applications with 5-min breaks during one hour showed a development of the calcium oxalate layer equivalent to the poultice treatment taking 10 h. This treatment could be preferred for large marble or limestone surfaces where poultice usage is economically not feasible.

Keywords

Oxalate Calcium Oxalate Ammonium Oxalate Stone Surface AmOx 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We would like to thank Dr. Paul Dumas from the SMIS beamline at the ‘SOLEIL’ synchrotron in Saint-Aubin (France) for his help in the statistical analysis of the IR maps. Also, we would like to thank Dr. Cristian Mocuta from the DIFFABS beamline at the ‘SOLEIL’ synchrotron for his great help during the XRD depth measurements. We also appreciate the help of Dr. Philippe Lerch from the IR beamline at the ‘Swiss Light Source synchrotron, Paul Scherrer Institute’ in Villigen (Switzerland) during the surface IR measurements.

This research was supported by the Interuniversity Attraction Poles Programme—Belgian Science Policy (IUAP VI/16). The text also presents results of GOA ‘XANES meets ELNES’ (Research Fund, University of Antwerp, Belgium) and from FWO (Brussels, Belgium) project nos. G.0704.08 and G.01769.09.

The research leading to these results has received financial support by the Access to Research Infrastructures activity in the 7th Framework Programme of the EU (CHARISMA Grant Agreement No. 228330).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • D. Mudronja
    • 1
    Email author
  • F. Vanmeert
    • 2
  • K. Hellemans
    • 2
  • S. Fazinic
    • 3
  • K. Janssens
    • 2
  • D. Tibljas
    • 4
  • M. Rogosic
    • 5
  • S. Jakovljevic
    • 6
  1. 1.Natural Science LaboratoryCroatian Conservation InstituteZagrebCroatia
  2. 2.Department of ChemistryUniversity of AntwerpAntwerpBelgium
  3. 3.Laboratory for Ion Beam InteractionsRudjer Boskovic InstituteZagrebCroatia
  4. 4.Institute of Mineralogy and Petrology, Department of Geology, Faculty of ScienceUniversity of ZagrebZagrebCroatia
  5. 5.Faculty of Chemical Engineering and TechnologyUniversity of ZagrebZagrebCroatia
  6. 6.Faculty of Mechanical Engineering and Naval ArchitectureUniversity of ZagrebZagrebCroatia

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