Sodium metabisulfite/food additive parameter detection

Sodium metabisulfite (Na2S2O5) is an inorganic compound that is white or yellow crystalline with a strong pungent odor. It is soluble in water and the aqueous solution is acidic. When in contact with strong acids, it releases sulfur dioxide and generates corresponding salts. If left in the air for a long time, it will oxidize to sodium sulfate, so sodium pyrosulfite cannot be stored for a long time. There are two production processes for sodium pyrosulfite: dry method and wet method. (1) Dry method. Stir soda ash and water evenly in a certain molar ratio, and when Na2CO3. nH2O is generated as a block, place it in the reactor. Maintain a certain gap between the blocks and then introduce SO2 until the reaction is completed. Remove the block and crush it to obtain the finished product. (2) Wet method. Add a certain amount of soda ash to the sodium bisulfite solution to generate a suspension of sodium sulfite, and then add SO2 to generate sodium pyrosulfite crystals. After centrifugation and drying, the finished product is obtained

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