Liquid sulfur dioxide can dissolve organic compounds such as amines, ethers, alcohols, phenols, organic acids and aromatic hydrocarbons, but most saturated hydrocarbons cannot. It has certain water solubility and reacts with water and steam to produce toxic corrosive steam.

At room temperature, wet sulfur dioxide reacts with hydrogen sulfide to separate sulfur. At high temperature and in the presence of catalyst, it can be reduced by hydrogen to hydrogen sulfide and by carbon monoxide to sulfur.

Strong oxidant can oxidize sulfur dioxide into sulfur trioxide, and oxygen can only oxidize sulfur dioxide into sulfur trioxide in the presence of catalyst. It has spontaneous combustion and no combustion-supporting property.

Extended data:

Use restrictions:

1, GB 2760-96: can be used as preservative for wine and fruit wine, 0.25g/kg. The residue of sulfur dioxide shall not exceed 0.05g/kg.

2. FAO/WHO (1984; Mg/kg): white sugar 20 (specification A) and 70 (specification B); Sugar powder, fructose and glucose powder 20 (self-contained); Soft candy 40; Anhydrous glucose and glucose monohydrate 20; Glucose syrup 40; 400 when used to make candy; High concentration glucose syrup 40, 150, used to make candy.

3、EEC( 1990； Mg/k): dried coconut 50; Beer 70; Canned candied fruit and coconut100; Apple juice 200; Most of the dried fruits are 2000; Papain and papain 30000.

4.EEC-HACSG suggested that it should not be used in children's food.

5.FDA, 182.3862(2000): Not used for meat and vitamin B source food. For the maximum dose stipulated in Japan, please refer to "sodium dithionite".

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