1 | Appearance/Description | White powder that readily absorbs moisture | White powder that readily absorbs moisture and free from visible extraneous matter |
2 | Solubility | Complies | Freely soluble in water; insoluble in alcohol |
3 | Identification (By chemical test) | Complies | Solution should slightly alkaline |
4 | Identification (By Loss on drying) | 0.4% | NMT 1.0% |
5 | Identification (Sodium) | Complies | A dense precipitate should form |
6 | Identification (Phosphate 1) | Complies | With silver nitrate solution neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide |
7 | Identification (Phosphate 2) | Complies | With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide |
8 | Identification (Phosphate 3) | Complies | A yellow colour should develop |
9 | Assay (on dry basis) | 99.6% | 98.0% - 100.5% |
10 | Assay (on dried basis) | 99.6% | 98.0% - 101.0% |
11 | Monosodium Phosphate | Less than 2.5% | NMT 2.5% |
12 | Water insoluble substances | 0.002% | NMT 0.05% |
13 | Appearance of solution | Complies | Solution should be clear and colourless |
14 | Chlorides | Less than 0.001% | NMT 0.001% |
15 | Sulfate | Less than 0.01% | NMT 0.01% |
16 | Arsenic | Less than 2 ppm | NMT 2ppm |
17 | Reducing substances | Complies | The solution should remain purplish red colour |
18 | Iron(Fe) | Not detected | NMT 0.002% |
19 | Loss on drying at 130°C | 0.4% | NMT 1.0% |
20 | Alkalinity | 9.15 | 9.0-9.4 |
21 | Carbonate | Complies | No effervescence should produce |