Sodium metabisulfite CAS#7681-57-4

CAS Number: 7681-57-4
Chemical Formula: H2O5S2.2Na
Synonyms:

Appearance: White Powder

MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)

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Product Details

Sodium metabisulfite CAS#7681-57-4

Sodium metabisulfite (chemical formula: Na2S2O5) appears as a white crystalline or powder solid with a slight sulfur odor. It is toxic upon inhalation and can strongly irritate skin and tissue. It can be decomposed to release toxic oxide fumes of sulfur and sodium upon high temperature. It can be mixed with water to form a corrosive acid. It is generally used as disinfectant, antioxidant, and preservative agent as well as a laboratory reagent. As a kind of food additive, it can be used as a preservative and antioxidant in food. It can also be applied to the wine and beer making. Moreover, it can be used to sanitize the equipment of homebrew and winemaking as a cleaning agent. It also have various kinds of other applications, e.g. being applied to photography, as an excipients in some tablets, for water treatment, as a source of SO2 in wine, as a bactericide and as a bleaching reagent as well as reducing agent. It can be manufactured through the evaporation of a sodium bisulfite which has been saturated with sulfur dioxide. It should be warned that sodium metabisulfite has certain acute effects on the respiratory system, eyes and skin. In severe case, it can cause breathing difficulty and even pulmonary damage which finally leads to death. Therefore, effective protective measures and attention should be taken during the operation.

Sodium metabisulfite Chemical Properties

Melting point	>300 °C (lit.)
bulk density	1000-1200kg/m3
density	1.48
refractive index	1.474
storage temp.	Store at +5°C to +30°C.
solubility	540 g/L (20°C)
form	Powder/Solid
color	White to slightly yellow
Specific Gravity	1.48
Odor	Sulphorous
PH	3.5-5 (50g/l, H2O, 20℃)
PH Range	4.5 at 50 g/l at 20 °C
Water Solubility	540 g/L (20 ºC)
Sensitive	Air & Moisture Sensitive
Merck	14,8638
Exposure limits	ACGIH: TWA 5 mg/m3 NIOSH: TWA 5 mg/m3
Stability:	Stable. Incompatible with strong oxidizing agents, strong acids. Contact with strong acids releases a poisonous gas. May be moisture and air sensitive.
Cosmetics Ingredients Functions	PRESERVATIVE REDUCING ANTIOXIDANT
InChI	1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2
InChIKey	HRZFUMHJMZEROT-UHFFFAOYSA-L
SMILES	[Na+].[Na+].[O-]S(=O)S([O-])(=O)=O
CAS DataBase Reference	7681-57-4(CAS DataBase Reference)
EPA Substance Registry System	Sodium metabisulfite (7681-57-4)

Safety Information

Hazard Codes	Xn,Xi
Risk Statements	22-31-41-36/37/38-52
Safety Statements	26-39-46-36-16
RIDADR	3260
OEB	B
OEL	TWA: 5 mg/m3
WGK Germany	1
RTECS	UX8225000
TSCA	TSCA listed
HS Code	2832 10 00
PackingGroup	III
Storage Class	13 - Non Combustible Solids
Hazard Classifications	Acute Tox. 4 Oral Eye Dam. 1
Hazardous Substances Data	7681-57-4(Hazardous Substances Data)
Toxicity	LD50 orally in Rabbit: 1540 mg/kg LD50 dermal Rat > 2000 mg/kg

Product Application Of Sodium metabisulfite CAS#7681-57-4

Sodium metabisulfite is used as an antioxidant in oral, parenteral, and topical pharmaceutical formulations, at concentrations of 0.01–1.0% w/v, and at a concentration of approximately 27% w/v in intramuscular injection preparations. Primarily, sodium metabisulfite is used in acidic preparations; for alkaline preparations, sodium sulfite is usually preferred. Sodium metabisulfite also has some antimicrobial activity, which is greatest at acid pH, and may be used as a preservative in oral preparations such as syrups.
In the food industry and in wine production, sodium metabisulfite is similarly used as an antioxidant, antimicrobial preservative, and antibrowning agent. However, at concentrations above about 550 ppm it imparts a noticeable flavor to preparations. Sodium metabisulfite usually contains small amounts of sodium sulfite and sodium sulfate.

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