1 | Appearance | White, slightly deliquescent crystals. | White, slightly deliquescent crystals or granules |
2 | Solubility | Complies | Very soluble in water, very slightly soluble in ethanol (96%) |
3 | Identification A (By Chemical test) | Complies | Solution should be slightly acid |
4 | Identification B1 (Phosphate) | Complies | A yellow precipitate should form of which color does not changes by boiling and which dissolves on addition of ammonia. |
5 | Identification B2 (Phosphate) | Complies | A yellow color should develop |
6 | Identification C (for Sodium) | Complies | A dense white precipitate should form |
7 | Identification D (By Loss on drying) | 0.4% | NMT 1.0% |
8 | Acidity | 4.36 | pH of the solution should be 4.2-4.5 |
9 | Clarity and colour of solution | Complies | Clear and colorless solution |
10 | Arsenic (As) | Not detected | NM 2 ppm |
11 | Iron (Fe) | 3 ppm | 10 ppm |
12 | Chloride (Cl) | Less than 200 ppm | NMT 200 ppm |
13 | Sulfate | Less than 300 ppm | NMT 300 ppm |
14 | Reducing substances | Complies | The solution should retain slight red color |
15 | Loss on drying at 130°C | 0.4% | NMT 1.0% |
16 | Assay (Dried substance) | 98.62% | 98.0% - 100.5% |