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Table - FSO2 required per pH to produce 0.8 ppm MSO2 (molecular sulphur dioxide)
- The values in the chart below are calculated to determine the amount of free sulphur dioxide (FSO2), required at a given pH, to achieve 0.8 ppm molecular SO2.
0.8 ppm of MSO2 is the concentration required to provide adequate anti microbial control.
- The levels of FSO2 in red wine however can not be determined and levels of TSO2 between 50-150 ppm are recommended, with amounts depending on the pH and circumstances. (See red wine)
| pH | 3.00 | 3.10 | 3.20 | 3.30 | 3.40 | 3.50 | 3.60 | 3.70 | 3.80 | 3.90 | 4.00 |
| FSO2 (ppm) | 13.6 | 17.1 | 21.5 | 27.1 | 34.1 | 43.0 | 54.1 | 68.1 | 85.7 | 108.0 | 135.9 |
| MSO2 (ppm) | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |