| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | Almost white or light grey or light pink powder or crystalline powder | Confirms |
| Identification | IR & UV | Positive reaction |
| Appearance of solution | Solution is clear and colorless≤0.5% | Solution is clear |
| Loss on drying | ≤0.50% | 0.23% |
| PH | 3.5~4.5 | 4.2 |
| Residue on ignition | ≤0.10% | 0.01% |
| Heavy metals | ≤0.002% | <0.002% |
| Chlorides | ≤100ppm | <100ppm |
| Sulfated ash | ≤200ppm | <200ppm |
| Bulk density | 0.2~0.3g/ml | 0.26g/ml |
| Related compounds | 3-aminosalicylic acid≤0.20% | 0.11% |
| aniline≤5ppm | 2ppm | |
| 2-amnophenol≤200ppm | <200ppm | |
| 4-aminophenol≤200ppm | <200ppm | |
| Residual solvents | LOD≤0.50% | None |
| Assay | 98.5%~101.5% | 99.10% |
| Conclusion: The Product Conforms to USP. |
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