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| Item | Specifications |
| Appearance | White crystalline powder |
| Assay | 99% min |
| Melting point | 110.0–115.0 ℃ |
| pH (3% water solution) | 3.5–5.5 |
| Free of VC | 10 ppm max |
| Heavy metal | 10 ppm max |
| Loss on drying | 0.5% max |
| Ignition residue | 0.2% max |