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Acetylsalicylic acid
| ITEMS | LIMIT |
| Characters | White crystal or crystalline powder. |
| Identification | A violet-red color is produced |
| Infrared absorption | According with IR reference spectrum |
| Loss on drying | Not more than 0.5% of weight |
| Readily carbonizable substance | no more color than M.F.Q |
| Residue on ignition | ≤0.05% |
| Substances insoluble in sodium carbonate | The solution is clear |
| Chloride | ≤0.014% |
| Sulfate | ≤0.04% |
| Heavy metals | ≤10ppm |
| Free salicylic acid | ≤0.1% |
| Organic volatile impurities | Meets the requirement |
| Assay | Contains C9H8O499.5%-101.0% |
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