Description
Quality standard
(1) Sensory index
| Items | Requirements | 
| Morphology | Powder, no clumping | 
| Color | Light yellow or milky white powder | 
| Impurity | No visible impurity | 
(2) Physicochemical index
| Items | Industrial grade | Pharmaceutical grade | 
| Total nitrogen
 (on DM) %  | 
≥14.0 | ≥14.0 | 
| Amino nitrogen
 (on DM ) %  | 
≥2.0 | ≥2.0 | 
| Ash
 (on DM ) %  | 
≤6.0 | ≤6.0 | 
| Loss on Drying % | ≤7.0 | |
| Sodium chloride
 (on DM)  | 
__ | __ | 
| Nitrite | __ | |
| PH (2% solution) | 5.0—7.0 | |
| Acid solution &
 alkalescency high-pressure test  | 
 
 __  | 
|
| Solubility,(2% water) | Soluble | Complete | 




