
| ITEMS | Standard | 
| description | white or almost white, crystalline powder, colorless crystals or granular, odorless has a strongly acid taste, very soluble in water, freely soluble in ethanol | 
| main content | 99.5-100.5% | 
| readily carbonisable substances A@470NM | 0.52MAX | 
| readily carbonisable substances A@470NM | 30%MIN | 
| sulfate | 150ppm max | 
| moisture | 0.2% max | 
| Iron | 5ppm max | 
| mercury | 1ppm max | 
| aluminum | 0.2ppm max | 
| heavy metals as pb | 5ppm max | 
| bacteria endotoxin | 0.5iu/mg max | 
| volatile organic impurities | no | 
| standard | BP, USP, FCC, E330 |