Tetrasodium diphosphate decahydrate, EssentQ®, Reag. Ph Eur

- Synonyms: Tetrasodium pyrophosphate, TSPP
- Na4P2O7·10H2O
- M = 446,06 g/mol
- CAS [13472-36-1]
- EINECS-No.: 231-767-1
- Solub. in water: (20 ºC): ~ 60 g/l
- Melting point: ~ 79,5 ºC
- Boiling point: 93,8 ºC
- LD 50 (oral, rat): 4000 mg/kg (anhydrous substance)
- Tariff number: 2835 39 00 00
- Applications: analytical chemistry, laboratory reagent, in food industry (E 450), emulsifier, stabilizer, humectant.

SPECIFICATIONS
assay (acidimetric): min. 99 %
insoluble in water: max. 0,025 %
pH (5 %, H2O): 9,5 - 10,8
chlorides (Cl): max. 0,01 %
nitrates (NO3): max. 0,01 %
ortho-phosphates (PO4): max. 0,05 %
sulfates (SO4): max. 0,05 %
arsenic (As): max. 3 ppm
calcium (Ca): max. 0,05 %
copper (Cu): max. 0,003 %
iron (Fe): max. 0,003 %
lead (Pb): max. 0,003 %
magnesium (Mg): max. 0,05 %
nickel (Ni): max. 0,003 %
Residual solvents are analysed according to guideline CPMP/ICH/283/95.