1 | Appearance | A white, slightly granular powder, hygroscopic. | A white or almost white, slightly granular powder,hygroscopic. |
2 | Solubility | Complies | Freely soluble in water, practically insoluble in ethanol (96%). |
3 | Identification A (By Chemical test) | Complies | The solution should strongly alkaline. |
4 | Identification B (carbonate) | Complies | A white precipitate should form that dissolves on addition of an excess of hydrochloric acid. |
5 | Identification C (Sodium) | Complies | A dense white precipitate should form. |
6 | Identification D (By Loss on drying) | 0.4% | 1.0% max |
7 | Appearance of solution | Complies | The solution is clear and not more intensely coloured than reference solution Y6 |
8 | Alkali hydroxides and bicarbonates | Complies | The solution should remain clear. |
9 | Chlorides | Less than 125ppm | NMT 125ppm |
10 | Sulfates | Less than 250ppm | NMT 250ppm |
11 | Arsenic (As) | Less than 5ppm | NMT 5ppm |
12 | Iron (Fe) | Less than 50ppm | NMT 50ppm |
13 | Loss on drying | 0.4% | 1.0% max |
14 | Assay (Dried substance) | 99.8% | 99.5% - 100.5% |