| Product name: | Sulphamerazine base | |
| Expiry Date: | Four years | |
| Inspection Standard: | USP23 | |
| Analysis content | Specifications | Analysis Results |
| Identification | A: The infrared absorption spectrum; | Meets A and B examine |
| B: The cupric sulfate reaction test. | ||
| Melting point | 234-239℃ | 234.2-235.2℃ |
| Description | White, yellowish-white or pinkish white, crystals or powder. | Meets. |
| Appearance of solution | Clear and not more deeply colored than reference solution Y4,BY4 or GY4. | Clear, ＜BY4 |
| Acidity | ≤0.5ml | ＜0.5ml |
| Related substances | Meets(≤0.5%） | Meets＜0.5% |
| Heavy metals | ≤0.002% | ＜0.002% |
| Loss on drying | ≤0.5% | 0.1% |
| Residue on ignition | ≤0.1% | 0.04% |
| Selenium | ≤0.003% | ＜0.003% |
| Assay(%) | 99.0%–100.5%(The dried substance) | 99.9%(The dried substance) |
| Conclusion : Meets USP23 specification | ||