 |
Item | Specifications | Results |
Assay (dry substance) | ≥99.0% | 99.8% |
Clarity of water solution | Transparency, colorless, none suspended matters | pass |
PH value of 1% aqueous solution | 5.0~7.0 | 5.7 |
Melting range | 203~206℃ | 205℃ |
Loss on drying | ≤0.5% | 0.28% |
Residue on ignition | ≤0.5% | 0.05% |
Heavy metals | ≤10 ppm | Complies |
Arsenic | ≤2 ppm | Complies |
Hydroquinone | ≤10 ppm | Complies |
Item | Specifications | Results |
Assay (dry substance) | ≥99.0% | 99.8% |
Clarity of water solution | Transparency, colorless, none suspended matters | pass |
PH value of 1% aqueous solution | 5.0~7.0 | 5.7 |
Melting range | 203~206℃ | 205℃ |
Loss on drying | ≤0.5% | 0.28% |
Residue on ignition | ≤0.5% | 0.05% |
Heavy metals | ≤10 ppm | Complies |
Arsenic | ≤2 ppm | Complies |
Hydroquinone | ≤10 ppm | Complies |
