سدیم دی سولفیت 106528 مرک

Description
Catalogue Number	106528
Synonyms	Sodium metabisulfite, Sodium pyrosulfite, Disulfite, Pyrosulfite

Product Information
CAS number	7681-57-4
EC index number	016-063-00-2
EC number	231-673-0
Grade	ACS,Reag. Ph Eur
Hill Formula	Na₂O₅S₂
Molar Mass	190.11 g/mol
HS Code	2832 10 00

Applications
Application	Sodium disulfite (sodium metabisulfite) for analysis EMSURE® ACS,Reag. Ph Eur. CAS 7681-57-4, pH 3.5 - 5 (50 g/l, H₂O, 20 °C).

Physicochemical Information
Density	2.36 g/cm3 (20 °C)
Melting Point	150 °C (decomposition)
pH value	3.5 - 5 (50 g/l, H₂O, 20 °C)
Bulk density	1000 - 1200 kg/m3
Solubility	650 g/l

Toxicological Information
LD 50 oral	LD50 Rat 1540 mg/kg
LD 50 dermal	LD50 Rat > 2000 mg/kg

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H302: Harmful if swallowed. H318: Causes serious eye damage. EUH031: Contact with acids liberates toxic gas.
Precautionary Statement(s)	P280: Wear eye protection. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P313: Get medical advice/ attention.
RTECS	UX8225000
Storage class	10 - 13 Other liquids and solids
WGK	WGK 1 slightly water endangering
Disposal	6 Sulfides and sulfites as well as other reducing substances, inorganic cyanides and isonitriles: Stir into sodium hypochlorite solution (Cat. No. 105614) and, if necessary, leave to react for several days. Caution: some substances may show a violent reaction! Draw off any toxic or flammable gases that may be formed. Excess oxidant should be neutralized with sodium thiosulfate (Cat. No. 106513). Container D or E.

Safety Information
Hazard Symbols	Harmful
Categories of danger	harmful, irritant
R Phrase	R 22-31-41 Harmful if swallowed.Contact with acids liberates toxic gas.Risk of serious damage to eyes.
S Phrase	S 26-39-46 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear eye/face protection.If swallowed, seek medical advice immediately and show this container or label.

Storage and Shipping Information
Storage	Store at +5°C to +30°C.

Transport Information
Declaration (railroad and road) ADR, RID	Kein Gefahrgut
Declaration (transport by air) IATA-DGR	No Dangerous Good
Declaration (transport by sea) IMDG-Code	No Dangerous Good

Specifications
Assay (iodometric)	98.0 - 100.5 %
Identity	passes test
Appearance of solution	passes test
pH-value (5 %; water)	3.5 - 5.0
Insoluble matter	≤ 0.005 %
Chloride (Cl)	≤ 0.005 %
Thiosulfate (S₂O₃)	≤ 0.05 %
Thiosulphate (S₂O₃)	passes test
Heavy metals (as Pb)	≤ 0.001 %
As (Arsenic)	≤ 0.0001 %
Fe (Iron)	≤ 0.0005 %