CAS Number 7631-90-5
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 preservative agent.
Detailed
description
Uses
Food additive
It may cause allergic reactions in those who are
sensitive to sulfites, including respiratory reactions in asthmatics, anaphylaxis and other allergic
reactions in sensitive individuals.
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.[8] Sodium metabisulfite
oxidizes in the liver to sulfate which is excreted in the urine.[8]
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 in desalination systems. It is also
used to remove chloramine from
drinking water after treatment.
Other uses
·
Added to local anaesthetic (lidocaine etc.)
solutions to prevent oxidation of vasoconstrictor adrenaline and thus improve
the shelf life of the solution
·
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.[10]
·
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 and
bactericide
·
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 inhibitor/oxygen scavenger.
·
It is used in the water treatment industry to quench
chlorine residual
Chemical properties
When mixed with water, sodium metabisulfite releases sulfur dioxide (SO2), a
pungent, unpleasant smelling gas that can also cause breathing difficulties in
some people. For this reason, sodium metabisulfite has fallen from common use
in recent times, with agents such as hydrogen peroxide becoming more
popular for effective and odorless sterilization of equipment. Released sulfur
dioxide however makes the water a strong reducing agent.
Na2S2O5 + 2 HCl → 2 NaCl + H2O + 2
SO2
Na2S2O5 → Na2SO3 + SO2
PRICE
$285.24/KG OR $129.65/IB
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