| Name of I ndex | Usp23 Index | Test Result |
| Identification | Conformed | Conformed |
| Content(Na 3 C 6 H 5 O 7 .2H 2 O),% | 99.0-101.0 | 99.52 |
| Acidity and Alkalinity | Accord with the test | Accord with the test |
| Sulphates ≤% | 0.01 | < 0.01 |
| Heavy metals(As Pb), ≤% | 0.001 | < 0.001 |
| Oxalate ≤% | 0.02 | < 0.02 |
| Easily carbonize substances | Accord with the test | Accord with the test |
| Chloride ≤% | 0.003 | < 0.003 |
| Loss on drying % | 11.0-13.0 | 12.2 |
| Solubility | Conformed | Conformed |