Sodium metabisulfite
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| Sodium Metabisulfite | |
|---|---|
| Image:Sodium metabisulfite.jpg | |
| Other names | Sodium Pyrosulfite Sodium Disulfite |
| Identifiers | |
| CAS number | |
| Properties | |
| Molecular formula | Na2S2O5 |
| Molar mass | 190.1 g/mol |
| Appearance | white powder |
| Density | 1100 to 1200 kg/m³ (solid) |
| Melting point |
>170 °C (begins at 150) |
| Solubility in water | 47 (20 °C) |
| Hazards | |
| NFPA 704 |
|
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
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). It is used as a sterilizer and antioxidant/preservative.
Uses
Food additive
It is used as a food additive, mainly as a preservative and is sometimes identified as E223. As an additive, it may cause allergic reactions, particularly skin irritation e.g. eczema; gastric irritation and asthma. It is not recommended for consumption by children. It is present in many dilutable squashes (i.e. fruit juice concentrates) and in candy bars such as Mounds [1]
Sterilization / Cleaning agent
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.
Stump Removing
In the brand Stump-Out, it is used in almost a pure form (98%) to cause degradation of lignin, creating pores for fuel adsorption, and consequently, ignition.[1]
Packaging
It can be purchased in powdered form. Either sodium or potassium metabisulfite will be the primary ingredient in Campden tablets and some stump removers. In solid form it ranges in color from white to slightly yellow.
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.
Alternatives
Include ascorbates 300-304 in some applications. Calcium sulfate 516 and ascorbic acid 300 are safe alternatives to sodium metabisulfite used as a flour improver.[citation needed]
References
| This article needs additional references or sources for verification. Please help improve this article by adding reliable references. Unverifiable material may be challenged and removed. |
de:Natriumdisulfit it:Metabisolfito di sodio hu:Nátrium-metabiszulfit
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
