Potassium bisulfite

Potassium bisulfite (or potassium hydrogen sulfite) is a chemical compound with the chemical formula KHSO3. It is used in various industries, including the food industry, wine making, and photography.

Chemical Properties

Potassium bisulfite is a white crystalline powder. It is soluble in water and its solution shows some green fluorescence. It is a salt, and can be derived from the neutralization reaction of potassium hydroxide and sulfurous acid.

Uses

Food Industry

In the food industry, potassium bisulfite is used as a food preservative. It acts as an antioxidant and a bactericide, inhibiting the growth of bacteria and fungi in food. It is commonly used in wine and beer making to prevent oxidation and preserve flavor.

Photography

Potassium bisulfite is also used in the photographic industry. It is a component of the developer solution used in black-and-white photography.

Health Effects

Exposure to potassium bisulfite can cause irritation to the eyes, skin, and respiratory tract. Ingestion can result in gastrointestinal disturbances. Chronic exposure can lead to more serious health problems such as asthma and allergies.

Regulation

In the European Union, the use of potassium bisulfite in food is regulated by the European Food Safety Authority. In the United States, it is regulated by the Food and Drug Administration.

See Also

• Sodium bisulfite
• Sulfur dioxide
• Preservative