| Item | Specification | Results | |
| Appearance | Light brown or light dark brown granule | Conforms | |
| Assay | ≥55% | 57.6% | |
| PH | 3.0-6.0 | 4.2 | |
| Ammonium salt | ≤1.0% | ＜1.0% | |
| Loss on drying | ≤4.0% | 3.0% | |
| Heavy Metals(as Pb) | ≤20mg/kg | ＜20mg/kg | |
| Arsenic(as As) | ≤2mg/kg | ＜2mg/kg | |
| Residue on ignition | ≤4.0% | 1.1% | |