| ≥1 piece |
White or yellowish crystalline granules or crystalline powders.
| Item | BP98 | E-332(ii) |
| Description | White, hygroscopic, granular powder or transparent crystals | |
| Identification | Positive tests for citrate and for potassium | |
| Appearance of solution | Clear and colourless | -- |
| Assay(on anhydrous basis),% | 99.0—101.0 | ≥99.0 |
| Chloride ,≤ppm | 50 | -- |
| Heavy metals（As Pb）,≤ppm | 10 | 5 |
| Sodium,≤% | 0.3 | -- |
| Oxalates,≤% | 0.03 | 0.01 |
| Sulphates,≤% | 0.015 | -- |
| Acidity or Alkalinity | Passes test | -- |
| Readity carbonisable substances | Not deeper than standard | -- |
| Loss on drying(180℃,4h) | 4.0-7.0 | ≤6% |
| pH(5%aqueous solution) | -- | 7.5-9.0 |
| Arsenic(As),≤ppm | -- | 1 |
| Lead(Pb),≤ppm | -- | 1 |
| Mercury(Hg),≤ppm | -- | 1 |