Sodium Metabisulfite BP
Sodium metabisulfite or sodium pyrosulfite is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as disodium metabisulfite. Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor.
It is used as a disinfectant, antioxidant, and preservative agent. It can be used to preserve color of some fruits, such as bananas. It is commonly used in homebrewing and winemaking to sanitize equipment.
Molecular Formula: Na2S2O5
Molecular Weight: 190.1 g/mol
CAS No.: 7681-57-4
Other name: Sodium Pyrosulphite
|Characters||It occurs as a white or almost white, crystalline powder or colorless crystals|
(a)It complies with the test for pH-3.5 to 5.0
(b)Specified test. The solution is colorless and gives reaction of sulfates
(c) It gives positive reaction of sodium
|Solubility||Freely soluble in water, slightly soluble in ethanol (96%)|
|Appearance of Solution||The solution is clear and colorless|
|pH||Between 3.5 to 5.0|
|Thiosulfates||Specified Test. The solution remains clear for not less than 15 min|
|Arsenic||Not more than 5 ppm|
|Iron||Not more than 20 ppm|
|Heavy metals||Not more than 20 ppm|
|Assay||Not less than 95.0% and not more than the equivalent of 100.5% of Na2S2O5|
Shelf life, Storage and Packing
It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.
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We observe WHO Good manufacturing practice and Good laboratory practice.