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Warfarin Sodium
| ITEMS | LIMIT |
| PH | 7.2 to 8.3 (1 in 100solution) |
| Water | less than 0.3% |
| Heavy metals | less than 10ppm |
| Absorbance in alkaline solution | less than 0.1 |
| Chromatographic purity Individual known impurity | less than 0.3% |
| Individual unknown impurity | less than 0.1% |
| Total impurity | less than 1.0% |
| Isopropyl alcohol content | 8.0%~8.5% |
| Organic volatile impurity | Comply the USP requirements |
| Residual solvents Ethanol | less than 1000ppm |
| Acetone | less than 1000ppm |
| Assay (on the anhydrous isopropyl alcohol-free basis) | 97.0-102.0% |
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