1.06528.1000 SODIUM DISULFITE MERCK

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 Quality Level MQ300 Physicochemical Information Density 2.36 g/cm3 (20 °C) Melting Point 300 °C (decomposition) pH value 4.5 (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 Pictogram(s) 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) P264: Wash skin thoroughly after handling. P270: Do not eat, drink or smoke when using this product. P280: Wear eye protection/ face protection. P301 + P312: IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P501: Dispose of contents/ container to an approved waste disposal plant. Signal Word Danger RTECS UX8225000 Storage class 10 - 13 Other liquids and solids WGK WGK 1 slightly hazardous to water 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 Categories of danger harmful, irritant Storage and Shipping Information Storage Store at +2°C to +30°C. 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 % passes test Heavy metals (as Pb) ≤ 0.001 % As (Arsenic) ≤ 0.0001 % Fe (Iron) ≤ 0.0005 %

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