Sodium pyrosulfite can also be called partial sodium sulfite, heavy oxysulfide, caustic sodium sulfite and partial sodium sulfite. The product is white or yellow crystalline powder or small crystal, with strong SO2 smell. The aqueous solution is acidic. In contact with strong acid, SO2 will be released to generate corresponding salts. If it is placed in the air for a long time, it will be oxidized to na2s2o6, so the product cannot exist for a long time.

主要用途

Main purpose

1、用作色谱分析试剂、防腐剂和还原剂，用于染料和制药工业

1. It is used as chromatographic reagent, preservative and reducing agent in dye and pharmaceutical industry

2、焦亚硫酸钠比亚硫酸盐有更强烈的还原性，作用与亚硫酸钠相似。我国规定可用于蜜饯、饼干、食糖、冰糖、饴糖、糖果、葡萄糖、液体葡萄糖、竹笋、蘑菇和蘑菇罐头，最大使用量0.45g/kg。蜜饯、竹笋、蘑菇及蘑菇罐头、葡萄和黑加仑浓缩汁的残留量(以SO2计)小于0.05g/kg;饼干、食糖、粉丝及其他品种的残留量小于0.1g/kg;液体葡萄糖的残留量不得过0.2g/kg。

2. Sodium pyrosulfite has stronger reducibility than sulfite, and its effect is similar to that of sodium sulfite. According to Chinese regulations, it can be used for preserves, biscuits, sugar, rock sugar, caramel, candy, glucose, liquid glucose, bamboo shoots, mushrooms and canned mushrooms, with a maximum dosage of 0.45g/kg. The residue of preserves, bamboo shoots, mushrooms, canned mushrooms, grapes and blackcurrant concentrated juice (calculated by SO2) is less than 0.05g/kg; The residue of biscuits, sugar, vermicelli and other varieties is less than 0.1g/kg; The residual amount of liquid glucose shall not exceed 0.2g/kg.

3、食品工业用作漂白剂、防腐剂、疏松剂、抗氧化剂、护色剂及保鲜剂。

3. The food industry is used as bleach, preservative, loosening agent, antioxidant, color protector and preservative.

4、医药工业用于生产氯仿、苯丙讽和苯甲醛。橡胶工业用作凝固剂。印染工业用作棉布漂白后的脱氯剂、棉布煮炼助剂。制革工业用于皮革处理，能使皮革柔软、丰满、坚韧，具有防水、抗折、耐磨等性能。化学工业用于生产羟基香草醛、盐酸羟胺等。感光工业用作显影剂等。

4. The pharmaceutical industry is used to produce chloroform, phenylpropanol and benzaldehyde. The rubber industry is used as a coagulant. Printing and dyeing industry is used as dechlorination agent for cotton bleaching and cotton scouring assistant. Leather industry is used for leather treatment, which can make leather soft, plump, tough, waterproof, folding resistant, wear-resistant and so on. Chemical industry is used to produce hydroxyvanillin, hydroxylamine hydrochloride, etc. Photosensitive industry is used as developer, etc.

焦亚硫酸钠还是一种致癌物质。因此，严格控制农产品中二氧化硫的残留量，是治理餐桌污染、保障消费者健康权益的重要。焦亚硫酸钠产有工业级和食品级之分，其质量指标有所不同。

Sodium pyrosulfite is also a carcinogen. Therefore, strictly controlling the residue of sulfur dioxide in agricultural products is an important measure to control table pollution and protect consumers' health rights and interests. Sodium pyrosulfite can be divided into industrial grade and food grade, and its quality indexes are different.