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Sodium disulfite, Pharmpur®, Ph Eur, BP, NF

- Synonyms: Sodium metabisulfite, Sodium pyrosulfiter- Na2S2O5r- M = 190,10 g/molr- CAS [7681-57-4]r- EINECS-No.: 231-673-0r- Solub. in water: (20 ºC): ~ 650 g/lr- Melting point: ~ 150 ºC (decomposes)r- LD 50 (oral, rat): 1540 mg/kgr- GHS-signal word: Dangerr- GHS-H sentences: H318 - H302 - EUH031r- GHS-P sentences: P280 - P264 - P305+P351+P338 - P310 - P301+P312 - P501ar- Tariff number: 2832 10 00 00r- Applications: analytical chemistry, laboratory reagent, bleaching agent, reducing agent (manufacture of dyes), antioxidant (in the pharmaceutics industry), in food industry (E 223), preservative agent.rrSPECIFICATIONSrassay (iodometric): 95,0 - 100,5 %rassay (iodometric, as SO2): 65,0 - 67,4 %ridentification: passes testrIdentification sodium: passes test: rreaction of sulphates: passes test: rappearance of solution: clear and colourlessrpH (5 %, H2O): 3,5 - 5,0rchlorides (Cl): max. 0,05 %rthiosulfates (S2O3): max. 0,05 %rthiosulfates (S2O3): passes testrarsenic (As): max. 5 ppmriron (Fe): max. 20 ppmr