1 | Appearance | Colourless crystals, efflorescent. | White or almost white, crystalline powder, colourless crystals or granules, efflorescent. |
2 | Solubility | Complies | Very soluble in water, freely soluble in ethanol (96%) |
3 | Identification A (By IR) | Complies | IR spectra of the sample should be concomitant with IR spectra of the corresponding standadrd |
4 | Identification B (By Water) | 8.06% | 7.5% to 9.0% |
5 | Appearance of Solution | Complies | The solution is clear and colourless or not more intensely coloured than reference solution Y7, BY7 or GY7. |
6 | Readily carbonizable substances | Complies | The solution is not more intensely coloured than a mixture of 1ml of red primary solution and 9ml of yellow primary solution. |
7 | Oxalic acid | Less than 360ppm | NMT 360ppm (Calculated as anhydrous oxalic acid) |
8 | Sulfates | Less than 150ppm | NMT 150ppm |
9 | Water | 8.06% | 7.5% to 9.0% |
10 | Sulphated ash | 0.03% | Not more than 0.1% |
11 | Assay (Anhydrous basis) | 99.8% | 99.5%-100.5% |