Complaint
| Name of index | FCC-V | E340(ii) | USP-30 | |
| Description | Colourless or white granular powder, crystals or masses; deliquescent substance, hygroscopic | |||
| Solubility | -- | Freely soluble in water. Insoluble in ethanol | -- | |
| Identification | Pass test | Pass test | Pass test | |
| pH value | -- | 8.7-9.4(1% solution) | 8.5--9.6(5% solution) | |
| Content (as dry base) | % | ≥98.0 | ≥98.0 (105ºC,4h) | 98.0-100.5 |
| P2O5 Content (Anhydrous basis) | % | -- | 40.3--41.5 | -- |
| Water insoluble (Anhydrous basis) | ≤% | 0.2 | 0.2 | 0.2 |
| Carbonate | -- | -- | Pass test | |
| Chloride | ≤% | -- | -- | 0.03 |
| Sulfate | ≤% | -- | -- | 0.1 |
| Organic volatile impurities | -- | -- | Pass test | |
| Fluoride | ≤ppm | 10 | 10(expressed as fluorine) | 10 |
| Monobasic or tribasic salt | -- | -- | Pass test | |
| Loss on drying | ≤% | 2 | (105ºC,4h) | 1 (105ºC) |
| Heavy metals | ≤ppm | -- | -- | 10 |
| Sodium | -- | -- | Pass test | |
| As | ≤ppm | 3 | 1 | 3 |
| Iron | ≤ppm | -- | -- | 30 |
| Cadmium | ≤ppm | -- | 1 | -- |
| Mercury | ≤ppm | -- | 1 | -- |
| Lead | ≤ppm | 2 | 1 | -- |
