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Sodium metabisulfite Features:
Molecular formula Na2S2O5
Molar mass 190.11 g/mol
Appearance white powder
Density 1.48 g/cm3
Melting point >170 0C (begins at 150 0C)
Solubility in water 54 g/100 ml
Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The name is sometimes referred to as disodium (metabisulfite, etc) .
. 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.
Sodium metabisulfite Application:
. It is used as a disinfectant, antioxidant and preservative agent
. It is used as a food additive, mainly as a preservative and is sometimes identified as E223.
. It may cause allergic reactions in those who are sensitive to sulfites.
. It is present in many dilutable squashes (i. e. fruit juice concentrates) and in candy bars such as Mounds. 
. 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 mg per kg of body weight. Sodium metabisulfite has no side effects; it is oxidised in the liver to harmless sulfate and excreted in the urine. 
. It is commonly used in homebrewing preparations 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.
. Concentrated sodium metabisulfite can be used to remove tree stumps. The Stump-Out brand has 98% sodium metabisulfite, and causes degradation of lignin in the stumps, facilitating removal. 
. It is also used as an excipient in some tablets, such as paracetamol.
. 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.
Sodium metabisulfite Specification:
. non food grade,
Parameter Unit specification Test method
Na2S2O5 g/100g Min.97.2 ANSI PH 4.276
SO2 g/100g Min.65.5 caculated
PH Value(5% solution) ---- 4.0-4.8 ISO36271994(E)
Nacl mg/kg 50 max IC
Heavy metals as Pb mg/kg 10 max ICP-AES
Fe mg/kg 10 Max ICP-AAS
Na2SO3+Na2SO4 ------ remainder calculated
Packing: Sodium metabisulfite is packed in 25 kg PE-bags or in FIBC's (big bags) .