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、用作色譜分析試劑、防腐劑和還原劑，用于染料和制藥工業

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

2、焦亞硫酸鈉比亞硫酸鹽有更強烈的還原性，作用與亞硫酸鈉相似。我國規定可用于蜜餞、餅干、食糖、冰糖、飴糖、糖果、葡萄糖、液體葡萄糖、竹筍、蘑菇和蘑菇罐頭，最大使用量0.45g/kg。蜜餞、竹筍、蘑菇及蘑菇罐頭、葡萄和黑加侖濃縮汁的殘留量(以SO2計)小于0.05g/kg;餅干、食糖、粉絲及其他品種的殘留量小于0.1g/kg;液體葡萄糖的殘留量不得過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、食品工業用作漂白劑、防腐劑、疏松劑、抗氧化劑、護色劑及保鮮劑。

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

4、醫藥工業用于生產氯仿、苯丙諷和苯甲醛。橡膠工業用作凝固劑。印染工業用作棉布漂白后的脫氯劑、棉布煮煉助劑。制革工業用于皮革處理，能使皮革柔軟、豐滿、堅韌，具有防水、抗折、耐磨等性能。化學工業用于生產羥基香草醛、鹽酸羥胺等。感光工業用作顯影劑等。

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.

焦亞硫酸鈉還是一種致癌物質。因此，嚴格控制農產品中二氧化硫的殘留量，是治理餐桌污染、保障消費者健康權益的重要。焦亞硫酸鈉產有工業級和食品級之分，其質量指標有所不同。

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.