Features of Sulfur oxide
Sulfur oxide, SO2, is a toxic and corrosive gas.
Physical and chemical properties
Physical state: Liquefied gas
Molecular weight: 64 g/mol
Sulfur oxide is used:
- as fumigation agent in the treatment of materials such as wood;
- in small quantities, in the treatment of foods such as wheat and wine;
- in small quantities, as a preservative agent both in the vineyard and during the production of wine in order to protect the grapes and the wine from microbial attacks or further oxidation;
- in calibration mixtures for environmental monitoring;
- as a bleaching agent in the paper industry;
- in the mining industry, due to the precipitation of sulfuric minerals.
Stability and reactivity
It reacts with the major part of metals in the presence of humidity releasing hydrogen, an extremely flammable gas.
It reacts with water to form corrosive acids.
It can reacts violently with alkali.
Combined with water, it causes rapid corrosion of some metals.