Sulfite

Sulfite is a chemical compound that contains the sulfite ion. In the IUPAC system, sulfites are referred to as sulfate(IV) or sulfate(4-). They are less oxidized than sulfates and more oxidized than sulfides.

Chemistry

Sulfites are salts of sulfurous acid. They are formed by the reaction of sulfur dioxide (SO2) with bases. The sulfite ion is a polyatomic ion with the chemical formula SO3^2-. Sulfites are often used as preservatives in dried fruits, wines, and potato products.

Health Effects

Some people are sensitive or allergic to sulfites. This can cause a variety of symptoms, including asthma, hives, and anaphylaxis. The U.S. Food and Drug Administration requires that foods containing sulfites be labeled as such.

Industrial Uses

Sulfites are used in a variety of industrial processes. They are used as reducing agents in photography and pharmaceuticals. They are also used in the pulp and paper industry to break down wood into paper.

Environmental Impact

Sulfites can have a negative impact on the environment. They can contribute to acid rain when they are released into the atmosphere. They can also harm aquatic life when they are released into water bodies.

See Also

• Sulfate
• Sulfide
• Sulfurous acid
• Sulfur dioxide

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