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Sulfamethazine Base
| ITEMS | LIMIT |
| CHARACTERISTICS | WHITE OR ALMOST WHITE CRYSTALLINE OR POWDER |
| IDENTIFICATION | PASS IR POSITIVE REACTION |
| MELTING POINT | 197 —200°C |
| ACIDITY | ≤0.1mol/L NaOH 0.2ml |
| COLOUR OF SOLUTION | ≤Y5BY5GY5 |
| HEAVY METALS | ≤20PPM |
| RELATED SUBSTANCES | ≤0.5% |
| LOSS ON DRYING | ≤0.5% |
| SULPHATED ASH | ≤0.1% |
| ASSAY | ≥99.0% |
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