A colorless, poisonous gas or liquid with a strong odor. It is formed naturally by volcanic activity, and is a waste gas produced by burning coal and oil and by many industrial processes, such as smelting. It is also a hazardous air pollutant and a major contributor to acid rain.
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Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 8 ppm will produce coughing.
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Side effects: Due to its oxidising effect, it may reduce the vitamin content in products. It is reduced in the liver to harmless sulphate and excreted in the urine. It can, however, cause breathing problems in asthmatic patients. In high concentrations (above those normally used in foods) it can cause gastrointestinal disturbances in some people.
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Disclaimer
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Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 8 ppm will produce coughing.
source
Side effects: Due to its oxidising effect, it may reduce the vitamin content in products. It is reduced in the liver to harmless sulphate and excreted in the urine. It can, however, cause breathing problems in asthmatic patients. In high concentrations (above those normally used in foods) it can cause gastrointestinal disturbances in some people.
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