Molecular Structure:

Product description: executive standard: european food grade  potassium metabisulfite E224
molecular 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 150-190^oC(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:
25 kg per bag, composite bag lined with plastic bag, or by user's request.