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disodium phosphate
Odourless, colourless crystals or white granular or crystalline powder
1,Formula: Na2HPO4; Na2HPO4·nH2O (n = 2,7 or 12)
2,Formula wt: anhydrous 141.96; Formula wt, dihydrate 177.99
3,CAS: anhydrous [7558-79-4]; CAS: dihydrate [10028-24-7]
5,Specificity: Colorless crystal, easily soluble in water, insoluble in ethanol, relative density 1.63,melting point 34.6°C,when heated to 180°C,it may lose crystal water, convert to anhydrous.
5,Packing: 25kg net paper bag or 1mt big bag with PE liner.
| Name of index | FCC-V | E339(ii) |
| pH of a 1 % solution | -- | 8.4—9.6 |
Content(as dry base),≥% | 98.0 | 98.0 |
P2O5 Content(Anhydrous basis) ,% | -- | 49.0-51.0 |
Lead, ≤% | 0.0004 | 0.0004 |
Water insoluble(Anhydrous basis),≤% | 0.2 | 0.2 |
Fluoride, ≤% | 0.005 | 0.001 |
Loss on drying, | 1,Anhydrous:≤5.0%; 2,Dihydrate:18.0%-22.0%. (120°C,4h) | 1,Anhydrous ≤5.0%, 2,Dihydrate ≤22.0% 3,Heptahydrate ≤50.0% 4,Dodecahydrate ≤61.0% (40°C,3h then 105°C,5h)) |
As,≤% | 0.0003 | 0.0003 |
Cadmium ≤% | -- | 0.0001 |
Mercury ≤% | -- | 0.0001 |
disodium phosphate
