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 %
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