Is sodium metabisulfite edible

The sodium metabisulfite factory told us that sodium metabisulfite is inedible, and sodium metabisulfite is an industrial product and is toxic.

Sodium metabisulfite:

Sodium metabisulfite; heavy sulfur oxide; sodium metabisulfite; sodium pyrosulfite

Molecular formula: Na2S2O5

Molecular weight: 190.10

Appearance and properties: colorless prismatic crystals or white powder; sulfur dioxide, acid, salty; yellow color gradually changes after storage.

Melting point (℃): >300 (decomposition)

Relative density (water = 1): 1.48

Solubility: soluble in water, the aqueous solution is acidic (54g/100ml water at 20℃; 81.7g/100ml water at 100℃). It is soluble in glycerin and slightly soluble in ethanol 5261. The relative density is 1.4. It is soluble in water, soluble in glycerin, and slightly soluble in ethanol. It is easily decomposed by moisture and easily oxidized to sodium sulfate in exposed air. Contact with strong acids releases sulfur dioxide and generates corresponding salts. Heated to 150 ℃ decomposition.

There is also sodium metabisulfite as a food additive, which cannot exceed the standard, otherwise it will be harmful to human health.

Sodium metabisulfite is a chemical substance that is harmful to the health of the body. This product has a significant stimulating effect on the skin and mucous membranes, which can cause conjunctival and bronchitis symptoms. People with allergies or asthma are very sensitive to this. Direct skin contact can cause burns.

According to "Standards for the Use of Food Additives" (GB2760-2011), sodium metabisulfite can be used as a bleaching agent, anti-5261 anti-corrosive agent, and antioxidant in food, including bamboo shoots, yuba, biscuits, vermicelli and vermicelli. The amount of sodium metabisulfite used in these foods is calculated based on the content of sulfur dioxide in the residue. Vermicelli and vermicelli are 0.1 grams per kilogram of sulfur dioxide residue.

We must pay attention to the dosage when using it, otherwise it will hurt us and the people around us.