Sodium metabisulfite/Sodium Pyrosulfite tech grade
|Items||Technical grade||Food grade|
|Assay||96% min||97% min|
|Assay as SO2||65% min||65% min|
|Water insoluble||0.05% max||0.05% max|
|Ferric (Fe)||0.003% max||0.003% max|
|Lead (Pb)||**||0.002% max|
|Arsenic (As)||**||0.0002% max|
- Added to local anaesthetic (lidocaine etc.) solutions to prevent
oxidation of vasoconstrictor adrenaline and thus improve the shelf
life of the solution
It is used in photography.
Concentrated sodium metabisulfite can be used to remove tree
stumps. Some brands contain 98% sodium metabisulfite, and cause
degradation of lignin in the stumps, facilitating removal.
It is also used as an excipient in some tablets, such as
paracetamol. Approximately 0.5 mg is used in epinephrine
autoinjectors such as the EpiPen.
A very important health related aspect of this substance is that it
can be added to a blood smear in a test for sickle cell anaemia
(and other similar forms of haemoglobin mutation). The substances
causes defunct cells to sickle (through a complex polymerisation)
hence confirming disease.
It is used as the source of SO2 in wine. An important anti-oxidant
It is also used to precipitate gold from auric acid (gold dissolved
in aqua regia).
It is used in waste treatment to chemically reduce hexavalent
chromium to trivalent chromium which can then be precipitated and
removed from an aqueous waste stream.
It is used as a bleaching agent in the production of Coconut cream
It is used as a reducing agent to break sulfide bonds in shrunken
items of clothing made of natural fibers, thus allowing the garment
to go back to its original shape after washing
It is used as an SO2 source (mixed with air or oxygen) for the
destruction of cyanide in commercial gold cyanidation processes.
It is used in the oil and gas industry as a corrosion
It is used in the water treatment industry to quench chlorine
Sodium Metabisulphite SM is used as a preservative in the starch
and food industry to control melanosis (black spot) in shrimp; for
fermentation in the wine industry; as an antichlor in the chemical
industry and as a redox catalyst in the acrylic fibre industry.
The product is also used as a reducing agent in the purification of
aldehydes and ketones; in the manufacture of sulphonated oil and
resin; for detoxification of cyanide in gold ore processing plants
and in the manufacture of photographic chemicals.
- Sodium disulphite
- Sodium pyrosulphite
This product is available in three grades:
- As a preservative in fruits and starch
- As an enzyme inhibitor in melanin formation (black and brown spots)
Treatment of waste water
As an antichlor and in the detoxification of cyanide and chromate
For bleaching wool and jute
To destroy cyanides
Paper and pulp
- For bleaching ground wood
- As an antichlor
Photography and film
For developer solutions and acidifying fixing baths
|Packaging and transportation|
- 25kg PPE woven / paper bags with heat-sealed HDPE inner liner
- 25kg HDPE bags
- 500kg; 1,000kg; 1,100kg bulk sacks
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.