| 
Test item
 | 
Specification
 |  | 
|  | 
Reagent grade
 | 
Pharmaceutical grade
 | 
| 
Appearance grade
 | 
Conform
 | 
Conform
 | 
| 
Assay [FeCl3] /%
 | 
≥99.0
 | 
≥98.0
 | 
| 
Water insoluble/%
 | 
≤0.01
 | 
≤0.05
 | 
| 
Free acid(HCl)/%
 | 
≤0.1
 | 
≤0.1
 | 
| 
Sulfate (SO4)/%
 | 
≤0.01
 | 
≤0.03
 | 
| 
Nitrate(NO3)/%
 | 
≤0.01
 | 
≤0.03
 | 
| 
Phosphate(PO4)/%
 | 
≤0.01
 | 
≤0.03
 | 
| 
Manganese(Mn) /%
 | 
≤0.02
 | 
-
 | 
| 
Ferroporphyrin (Fe2+)/%
 | 
≤0.002
 | 
≤0.005
 | 
| 
Copper (Cu) /%
 | 
≤0.005
 | 
≤0.01
 | 
| 
Zinc (Zn) /%
 | 
≤0.003
 | 
≤0.01
 | 
| 
Arsenic (As) /%
 | 
≤0.002
 | 
≤0.01
 | 
| 
Ammonia not sediment/%
 | 
≤0.1
 | 
≤0.5
 |