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Diclofenac sodium
| ITEMS | LIMIT |
| Characteristic | A white or slightly yellowish crystalline powder |
| Identification | A: IR, complies |
| B: HPLC, complies | |
| C: Test of sodium salt, complies | |
| Appearance of solution | 5.0% of methanol solution |
| 440nm, NMT 0.05 | |
| Clarity of solution | Equal to methanol |
| pH | 7.0 ~ 8.5 |
| Related substances | Any specified impurity: NMT 0.2% |
| Any unspecified impurity: NMT 0.1% | |
| Total impurities: NMT 0.5% | |
| Heavy Metals | NMT 10ppm |
| Loss on drying | NMT 0.5% |
| Assay | 99.0% ~ 101.0% |
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