Complaint
| Testing Item | Standard | Result |
| Assay (on dry basis) | White or almost white, crystalline powder or small, colourless granule | conforms |
| Appearance | 98.5% ~ 101.0% | 100.0% |
| Identification | A: IR absorption; C: Reaction of nitrates | conforms |
| Appearance of solution | Clear, not more intense than Y7 | conforms |
| PH | 6.8 ~ 7.5 | 7.2 |
| Loss on drying | ≤0.5% | 0.08% |
| Chloride | ≤0.06% | <0.06% |
| Sulphated ash | ≤0.1% | 0.02% |
| Heavy metals | ≤10 ppm | <10 ppm |
