1 | Description | A white, crystalline powder; with a faint odour;hygroscopic | A white, crystalline or granular powder or flakes; odourless or with a faint odour;hygroscopic. |
2 | Solubility | Passes | Freely soluble in water, sparinly soluble in ethanol (95%) |
3 | Identification A (By Chemical test) | Complies | A white crystalline precipitate is produced. |
4 | Identification B (By Chemical test) | Complies | Positive test of sodium salt and benzoates. |
5 | Appearance of solution | Complies | A 10.0%w/v solution in carbon dioxide-free waer is clear and not more intensely coloured than reference solution YS6. |
6 | Acidity or Alkalinity | Complies | Not more than 0.2ml of 0.1M hydrochloric acid or 0.2ml of 0.1M sodium hydroxide is required to change the colour of the solution. |
7 | Arsenic (As) | NMT 2 ppm | NMT 2 ppm |
8 | Heavy metals | NMT 20 ppm | NMT 20 ppm |
9 | Chlorinated compounds | Complies | The filtrate complies with the limit test for chlorides. |
10 | Loss on drying | 0.51% | NMT 2.0% |
11 | Assay (on dried basis) | 99.30% | 99.0% - 100.5% |