| 1 | Description | Colourless hygroscopic crystals with faint odour. | Colourless hygroscopic crystals with faint odour. | |
| 2 | Solubility(10% aq) | Complies | Clear and colourless solution. | |
| 3 | Assay | 99.44% | min. 99.00% | |
| 4 | pH(5% aq soln) | 6.96 | 6.5 - 7.5 | |
| 5 | UV absorbance profile (10% in water, 10mm cell)@ 250nm | 0.021 | 0.05 max | |
| 6 | UV absorbance profile (10% in water, 10mm cell)@ 260nm | 0.009 | 0.04 max | |
| 7 | UV absorbance profile (10% in water, 10mm cell)@ 270nm | 0.005 | 0.03 max | |
| 8 | UV absorbance profile (10% in water, 10mm cell)@ 280nm | 0.006 | 0.02 max | |
| 9 | UV absorbance profile (10% in water, 10mm cell)@ 500nm | 0.000 | 0.02 max | |
| 10 | Water (By KF) | 0.8% | 1.0% max | |
| 11 | Sulphated ash | 0.006% | 0.01% max | |