Sulfur dioxide

Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. At standard atmosphere, it is a toxic gas with a pungent, irritating and rotten smell. The triple point is 197.69 K and 1.67 kPa. It is released naturally by volcanic activity.

Sulfur dioxide was used by the Romans in winemaking when they discovered that burning sulfur candles inside empty wine vessels kept them fresh and free from vinegar smell.

USES

Sulfur dioxide is sometimes used as a preservative for dried apricots, dried figs, and other dried fruits. As a preservative, it maintains the colorful appearance of the fruit and prevents rotting. It is also added to sulfured molasses.

In winemaking, it serves as an antibiotic and antioxidant, protecting wine from spoilage by bacteria and oxidation.

