| Index | Chinses Pharmacopoeia 2010 cp2010 | united states pharmacopoeia usp31 | British pharmacopoeia bp2008 |
| content(%) | 98.0-102.0 | 96.0-101.5 | 98.0-101.5 |
| clarity and color | Less than 1 turbidity solution | / | Less than 1 turbidity solution |
| PH Value ml | ≤0.3 | ≤0.3 |
≤0.2 (acidity)
≤0.3 (alkalinity) |
| chloride % | ≤0.003 | ≤0.007 | ≤0.005 |
| sulfate% | ≤0.01 | ≤0.01 | ≤0.01 |
| oxalate(%) | ≤0.02 | / | / |
| Reducing sugar % | / | slight trace | ≥12.8ml |
| loss on drying % | ≤0.5 | ≤0.3 | / |
| Burnt residue % | ≤0.1 | / | ≤0.1 (acid ash) |
| Heavy metal(%) | ≤0.001 | / | / |
| salt % | ≤0.0002 | ≤0.0001 | / |
| lead % | / | / | ≤0.00005 |
| Melting point °C | 166-170 | 164-169 | / |
| Specific Rotation | / | +137°-+145° | / |