Sulfur Dioxide Detection

Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO₂. It is produced by volcanoes and in various industrial processes. Since coal and petroleum often contain sulfur compounds, their combustion generates sulfur dioxide.

 

Further oxidation of SO₂, usually in the presence of a catalyst such as NO₂, forms H₂SO₄, and thus acid rain. This is one of the causes for concern over the environmental impact of the use of these fuels as power sources.

 

Sulfur dioxide is sometimes used as a preservative for dried apricots and other dried fruits, owing to its antimicrobial properties. It is sometimes called E220 when used in this way. Sulfur dioxide is an important compound in winemaking, and is designated as parts per million in wine, E number: E220.