Siegfried Siegesmund - Monument Future

Figure 2:A) Spectral data showing the initial state of the Savonnières limestone (blank) and the progress of the colour change after adding Arthrobacter agilis during the different cycles (Cycle 1–3). B) Savonnières stone after three cycles showing the discolouration compared to the initial state at the top section.

Lede stone at Ghent and Berlare were both deteriorated and contained gypsum crusts. The crusts were more elaborate in Ghent with overall a higher content of soluble salts. 16S rRNA gene amplicon sequencing revealed potential stone deteriorating nitrogen and sulphur prokaryotes, especially on the City Hall. This suggests a positive correlation with air pollution. However, they were only present with a low concentration in some samples and absent in the isolates. Currently, a strong effect of prokaryotes on crust formation is not expected. Furthermore with decreasing sulphur pollutions, the gypsum is mainly a result of historical accumulation. on Lede stone, prokaryotes can have an impact on the appearance of the monuments as Arthrobacter agilis successfully discoloured Savonnières limestone.

This work was funded by Research Foundation Flanders (Research grant number 11D4518N). We would like to thank Sarah Williamson and the lab technicians of CMET for their help with the experiments.

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Martina Haselberger 1 , Marija Milchin 1 * , Katharina Fuchs 1, Galbadrakh Enkhbat 2 , Tserendorj Tsolmon 2, Johannes Weber 3 , Gabriela Krist 1

IN: SIEGESMUND, S. & MIDDENDORF, B. (EDS.): MONUMENT FUTURE: DECAY AND CONSERVATION OF STONE.

– PROCEEDINGS OF THE 14TH INTERNATIONAL CONGRESS ON THE DETERIORATION AND CONSERVATION OF STONE –

VOLUME I AND VOLUME II. MITTELDEUTSCHER VERLAG 2020.

1Institute of Conservation, University of Applied Arts Vienna, Austria