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 | Complies | Freely soluble in water. |
3 | Identification A (By Chemical test) | Complies | A white crystalline precipitate should produce |
4 | Identification (Reaction of sodium) | Complies | A dense white precipitate should form |
5 | Identification B (Reaction B for benzoates) | Complies | A white sublimate should deposit on the inner wall of the tube and no charring should occur |
6 | Identification B (Reaction C for benzoates) | Complies | After crystallization, melting point should be about 122°C. |
7 | Appearance of solution | Complies | solution should be clear and not more intensely coloured than reference solution YS6. |
8 | Acidity or Alkalinity | Complies | Not more than 0.2ml of 0.1M hydrochloric acid or 0.2ml of 0.1M sodium hydroxide should require to change the colour of the solution. |
9 | Arsenic (As) | Less than 2 ppm | NMT 2 ppm |
10 | Heavy metals | Less than 10 ppm | NMT 10 ppm |
11 | Chlorinated compounds | Complies | Any opalescence produced in the sample solution should not be more intense than obtained with standard solution |
12 | Loss on drying | 0.4% | NMT 2.0% |
13 | Assay (on dried basis) | 99.8% | 99.0% - 100.5% |