Sodium metabisulfite/Sodium Pyrosulfite tech grade
Usage of make sodium metabisulfite :
Sodium metabisulfite Food: preservative, bleach, loosening agent.
Sodium metabisulfite Industrial: It used in dyeing and printing industry, organic synthesis,
printing, leather, pharmaceutical and other sectors.
Sodium metabisulfite Storage:kept in a light-proof,well-colsed,dry and cool place.
Specification of make sodium metabisulfite :
|Food Grade||Industry Grade|
|Purity ( As Na2S2O5)||98.0% min||96.0% min|
|Sulfur Dioxide( SO2)||65.0% min||65.0% min|
|Arsenic ( As )||0.0002% max||-|
|Heavy metals ( As Pb )||0.0005% max||-|
|Selenium (Se )||0.0005% max||-|
|Iron (Fe)||0.001% max||0.002% max|
|Water insoluble||0.02% max||0.05% max|
|PH value :||4.0-4.8||4.0-4.8|
|Remark :||Conformed with FCC V and E 223 Standard|
It is used as a preservative and antioxidant in food and is also
known as E223.
It may cause allergic reactions in those who are sensitive to
sulfites, including respiratory reactions in asthmatics,
anaphylaxis and other allergic reactions in sensitive
Sodium metabisulfite and potassium metabisulfite are the primary
ingredients in Campden tablets, used for wine and beer making.
The acceptable daily intake is up to 0.7 milligrams per kilogram of
body weight. Sodium metabisulfite oxidizes in the liver to
sulfate which is excreted in the urine.
Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E.
sodium metabisulphite or sodium pyrosulphite) is an inorganic
compound of chemical formula Na2S2O5. The substance is sometimes
referred to as disodium metabisulfite. It is used as a
disinfectant, antioxidant and preservativeagent.
The anion metabisulfite is a hybrid of dithionite (S2O42−) and
dithionate (S2O62−). The anion consists of an SO2 group linked to
an SO3 group, with the negative charge more localized on the SO3
end. The S–S bond length is 2.22 Å, and the "thionate" and
"thionite" S–O distances are 1.46 and 1.50 Å respectively.
SODIUM METABISULFITE is a white crystalline or powder solid with a
slight sulfur odor. Toxic by inhalation . Strongly irritates skin
and tissue. Noncombustible, but may decompose to emit toxic oxide
fumes of sulfur and sodium when heated to high temperature. A
corrosive acid when mixed with water. Used as a food preservative
and as a laboratory reagent.
Sanitization and cleaning agent
It is commonly used in homebrewing and winemaking to sanitize
equipment. It is used as a cleaning agent for potable water reverse
osmosis membranes indesalination systems. It is also used to remove
chloramine from drinking water after treatment.