- Na2SO3r- M = 126,04 g/molr- CAS [7757-83-7]r- EINECS-No.: 231-821-4r- Solub. in water: (20 ºC): 220 g/lr- Melting point: > 500 ºC (decomposes)r- LD 50 (oral, rat): 2610 mg/kgr- Tariff number: 2832 10 00 00r- Applications: analytical chemistry, laboratory reagent, solvents (in the cellulose industry), antibacterian, absorbent for: nitrogen oxides (gases).rrSPECIFICATIONSrassay (iodometric): 95,0 - 100,5 %rIdentification A (EP): passes testrIdentification D (EP): passes testrIdentification sulfates: passes testrIdentification sodium: passes testrappearance of solution: clear and colourlessrthiosulfates (S2O3): max. 0,1 % riron (Fe): max. 10 ppmrzinc (Zn): max. 25 ppmr