Calculation of SO2 concentration

Table showing the concentration of molecular SO2 as a function of pH and free SO2 expressed in mg/l

(these values vary according to temperature and alcohol, which can be modified in the green boxes)
Results
Free SO2 / PH
Ph \
5 10 15 20 25 30 35 40 45 50
2,8
2,9
3,0
3,1
3,2
3,3
3,4
3,5
3,6
3,7
3,8
3,9
4,0
4,1
4,2
4,3
4,4
4,5
Molecular SO2 > 0.60 = good protection
Molecular SO2 0.35 - 0.60 = minimum protection
Molecular SO2 < 0.35 = poor protection < 0.35 = mauvaise protection