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Potassium disulfite, Pharmpur®, Ph Eur, NF

- Synonyms: Potassium metabisulfite, Potassium pyrosulfite
- K2S2O5
- M = 222,33 g/mol
- CAS [16731-55-8]
- EINECS-No.: 240-795-3
- Solub. in water: (20 ºC): 450 g/l
- Melting point: 190 ºC
- LD 50 (oral, rat): 2300 mg/kg
- GHS-signal word: Danger
- GHS-H sentences: H318 - H335 - EUH031
- GHS-P sentences: P261 - P280 - P305+P351+P338 - P310 - P405 - P501a
- Tariff number: 2832 20 00 00
- Applications: analytical chemistry, laboratory reagent, inorganic salts, preservative agent (in food industry).

SPECIFICATIONS
assay (iodometric): 95,0 - 101,0 %
assay (iodometric, as SO2): 51,8 - 57,6 %
identification B (EP): passes test
Identification C (EP): passes test
Identification potassium USP: passes test
Identification sulfites (USP): passes test
appearance of solution: clear and colourless
pH (5 %, H2O): 3,0 - 4,5
thiosulfates (S2O3): passes test
iron (Fe): max. 10 ppm
zinc (Zn): max. 25 ppm