Cit:Siedel.etal:2014

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Autor Siedel, H. and Franzen, C. and Pummer, E.
Jahr 2014
Titel In-situ vacuum desalination - case study of a baroque tombstone
Bibtex
DOI 10.5165/hawk-hhg/270
Link Datei:34 SWBSS-2014 Siedel etal.pdf
Bemerkungen In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2043, S. 481-496


Eintrag in der Bibliographie

[Siedel.etal:2014]Siedel, H.; Franzen, C.; Pummer, E. (2014): In-situ 'vacuum' desalination - case study of a baroque tombstone. In: Hilde De Clercq (Hrsg.): Proceedings of SWBSS 2014 3rd International Conference on Salt Weathering of Buildings and Stone Sculptures,KIK-IRPA, Royal Institute for Cultural Heritage Brussels 481-496, 10.5165/hawk-hhg/270Link zu Google ScholarLink zum Volltext

Keywords[Bearbeiten]

desalination techniques, sandstone, negative pressure/underpressure, poultices

Abstract[Bearbeiten]

A combined "vacuum" and poultice desalination procedure was applied to a tombstone made of Cotta sandstone. The desalination steps were controlled analytically by salt profiles in the stone, as well as by analyses of waste water and poultice material. A remarkable reduction of high total salt contents to a depth of 1-2 cm could be achieved, with the best effects in the lower part of the monument (at 50 cm height). In particular, high gypsum contents within the Cotta sandstone were significantly reduced, which could hardly be achieved only by poultice treatments. With respect to the better soluble nitrate compounds, the results are contradictory. Although nitrate could be extracted near the surface, large parts were moved into the stone by advection. The results suggest that the "vacuum" procedure could be considered as an effective in-situ bath desalination with frequent water exchange rather than a convective desalination where the salt ions follow the water streaming through the object. The method has some potential for in-situ desalination of smaller stone objects and should be further developed.

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