The Food and Drug Administration cautions that there may be potential health problems for people with asthma.Use is somewhat more important in white wines as they have less of other antioxidants than do red wines.Levels of SO2 are measured in milligrams per liter (mg/l) which is the same as saying parts per million (ppm).Because of the above information, it is our belief that by using sulfur dioxide, better wine will be made.Nitrogen levels may be better preserved for wine yeast that otherwise would be competed for with wild yeast strains.Not only used directly in wine but also in disinfecting equipment.Inhibits lactic bacteria (if this is not desired then should hold off on use of sulfur dioxide).Inhibits acetic bacteria (the vinegar culprit).It is an antioxidant (prevents many undesirable bonds of chemicals with oxygen).It has been used in wine making since early Egyptian and Roman times. It is very soluble in water (wine is mostly water).
Sulfur dioxide (SO2) is a gas under normal conditions. Use and Measurement of Sulfur Dioxide in Wine
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