| Sr.No | Test | Specification (IP) | Specification (BP) |
| 1. | Description | ColourIess crystals or a white powder; odourless | White or almost whitepowder or colourless crystals |
| 2. | Identification | The resulting solution gives the reaction ofpotassium and iodide salt | As per BP |
| 3. | solubility | Freely soluble in water,practically insoluble in ethanol and ether | Very soluble in water,freely soluble in |
| 4. | Appearance of solution | Solution A is clear and colorless | Solution S is clear and colorless |
| 5. | Alkalinity | No colour is produced | NMT 0.5 mL of0.01 M HCL isrequired |
| 6. | Arsenic | NMT 2 ppm | --- |
| 7. | Barium | No turbidity develops within one minute | --- |
| 8. | Cyanide | No blue colour is produced | --- |
| 9. | Iodate | No blue colour is producedwithin 2 minutes | No blue colour develops. |
| 10. | Heavy metals | 10 ppm | --- |
| 11. | Sulphates | 150 ppm | Maximum 150 ppm |
| 12. | Iron | 20 ppm | Maximum 20 ppm. |
| 13. | Thiosulphate | A blue colour is produced | bluecolour is produced. |
| 14. | Loss on drying | NMT 1.0% | NMT 1.0% |
| 15. | Assay | 99.0 % to 100.5 % ODB | 99.0 % to 100.5 % ODB |