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Potassium metabisulfite
executive standard: european food grade potassium metabisulfite E224molecular formula: K2S2O5=222.326 molecular weight: 222.33 CAS Number: 16731-55-8
Product characteristics: The Product was colorless crystal or white crystalline powder with the relative density of 2.34 .The melting point was 150-190oC(decomposition). The product had a flavor of sulfur dioxide and soluble in water with acidic aqueous solution, it was not soluble in ethanol. Sulfur dioxide was released from acidic solution and oxidized to sulfate in the air.
Technical index
Test item | Unit | Specification | Test method |
K2S2O5 | g/100g | 97.2 | Acc.Fcc IV p.322 |
SO2 | g/100g | 56.0 | calculation |
K2S2O3 | g/100g | 0.1 | ISO 3629-1996(E) |
Na | g/100g | 2 | AAS |
Cl | g/kg | 0.5 | IC |
pH-value(10%solution) | - | 3.8-4.8 | RCA/Q-S-066 |
heavy metal(measured by Pb) | mg/kg | 10 | AAS |
As | mg/kg | 1 | AAS |
Cu | mg/kg | 1 | ICP-AES |
Fe | mg/kg | 5 | ICP-AES |
Hg | mg/kg | 0.1 | AAS(cold vapour) |
Pb | mg/kg | 1 | ICP-AES |
Se | mg/kg | 1 | AAS |
Zn | mg/kg | 1 | ICP-AES |
K2SO3 +K2SO4 | mg/kg | excess material | calculation |
Product usage:the product was used for the preparation of photographic developing solution, which was also used as food bleaching agents, preservatives, antioxidants .In addition, it could be used to retain freshness of wine, fruit juice, beer clarifying agent, fruits and vegetables, meat , grapes, as well as the non-cyanide silver plating.Product package:
25kg plastic bag per net, 18000kg into 1*20FCL Container with pallets. Or according to the buyer's requirements.
Product Package and transport
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potassium sulfurous acid