Sodio diidrogenofosfato diidrato, Pharmpur®, Ph Eur, BP, USP

- Synonyms: Sodium biphosphate, Monosodium orthophosphate, Primary sodium phosphate, Sodium phosphate monobasic
- NaH2PO4·2H2O
- M = 156,01 g/mol
- CAS [13472-35-0]
- EINECS-No.: 231-449-2
- Solub. in water: (20 ºC): 850 g/l
- Melting point: 60 ºC
- LD 50 (oral, rat): 8290 mg/kg (anhydrous substance)
- Tariff number: 2835 22 00 00
- Applications: analytical chemistry, laboratory reagent, for pharmaceutical use, in food industry (E 339).

SPECIFICATIONS
assay (acidimetric, referred to dried sample): 98,0 - 100,5 %
Identification A (EP): passes test
Identification sodium: passes test
Identification phosphate: passes test
appearance of solution: clear and colourless
insoluble matter: max. 0,2 %
pH (5 %, H2O): 4,2 - 4,5
chlorides (Cl): max. 0,014 %
sulfates (SO4): max. 300 ppm
aluminium,calcium and related elements: passes test
arsenic (As): max. 2 ppm
iron (Fe): max. 10 ppm
reducing substances: passes test
loss on drying (130 ºC): 21,5 - 24,0 %
water content: 18,0 - 26,5 %