Sulphur dioxide

Sulphur Dioxide (SO2) is a colourless gas with a sharp, burning odour. It is produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores that contain sulphur.

Chemical Properties

Sulphur dioxide is a sulphur compound that is a toxic gas with a pungent, irritating smell. It is released naturally by volcanic activity and is produced as a by-product of the burning of fossil fuels contaminated with sulphur compounds and the processing of sulphur-containing ores. It is a heavy, colourless, poisonous gas with a pungent odour. It is soluble in water, ethanol and sulphuric acid.

Uses

Sulphur dioxide is used in many industrial processes such as chemical preparation, refining, pulp-making and solvent extraction. It is used in the production of sulphuric acid, bleaching agents, preservatives and refrigerants. In winemaking, it is used as a disinfectant.

Health Effects

Exposure to sulphur dioxide can cause irritation to the eyes, nose, throat, and lungs, and can cause coughing, shortness of breath, and a tight feeling around the chest. These symptoms can be delayed and not noticed until long after exposure. Long-term exposure to sulphur dioxide can affect lung function and worsen existing heart disease.

Environmental Impact

Sulphur dioxide is a major air pollutant and has significant impacts on human health. In addition, the concentration of sulphur dioxide in the atmosphere can influence the habitat suitability for plant communities, as well as animal life. Sulphur dioxide emissions are a precursor to acid rain and atmospheric particulates.

See Also

• Air pollution
• Acid rain
• Sulphuric acid
• Fossil fuel