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0
0.5
1
1.5
2
2.5
3
3.5
gS/(m 2 .year)
Figure 8.20. Flux of “dry” sulfur on Villarlod molasse a soft calcite-containing sandstone,
exposed in different sites [FUR 91]
The sulfur deposition also depends on the intrinsic reactivity of each stone: a
gneiss traps very small quantities of sulfur (F < 0.2 g/m 2 /year), while limestones are
far more reactive (F =3.8 g/m 2 /year for Jaumont limestone). It is noticeable that even
in the same petrographic family the deposition rates may be considerably different,
as illustrated in Figure 8.21 for Milan.
Aerosol trap
gneiss
Main sandstone
Carrara marble
rose de Beaune
li
Bollingen sandstone
Nersac limestone
Villarlod molasse
Jaumont limestone
Bern molasse
0
1
2
3
4
5
S(g/m 2 .year)
Figure 8.21. Deposition rate of “dry” sulfur on different stones
exposed in Milan [FUR 91]
The second category of sulfur deposits is “wet”. These wet deposits originate
from SO 2 being absorbed by rain water and transformed into sulfuric acid (so-called
acid rain):
SO
+
H O
H SO
2
2
2
3
 
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