1. Department of Geosciences, University of Padua, 35131 Padova, Italy
2. Department of Chemistry, University of Bari Aldo Moro, 70125 Bari, Italy
3. Interdepartmental Center Research Laboratory for the Diagnostics of Cultural Heritage, University of Bari Aldo Moro, 70125 Bari, Italy
4. Department of Earth Sciences, University of Pisa, 56126 Pisa, Italy
5. Department of Chemical Sciences, University of Padua, 35131 Padova, Italy
6. Department of Geoenvironmental and Earth Sciences, University of Bari Aldo Moro, 70125 Bari, Italy