| ITEM | STANDARD |
| Appearance | White?or?almost?white,?crystalline?powder?or?colourless?crystals? |
| Identification | IR,Characteristic?Reaction?and?Test?of?chlorides |
| Assay? | 98.5-101.0 |
| pH | 2.7-3.3 |
| Absorbance?of?solution | =<0.025? |
| Solubility? | Freely?Soluble?in?Water,Soluble?in?Glycerol,Slightly?Soluble?in?Alcohol? |
| Appearance?of?solution | ?Clear?and?not?more?than?Y7 |
| Sulphates | =<300PPM |
| Limit?of?nitrate | No?brown?ring?is?produced? |
| Heavy?metals | =<20?PPM |
| Related?substances? | Any?impurity?%?=<0.4 |
| Water | =<5.0 |
| Sulphated?ash/Residueon?ignition? | =<0.1 |
| Chromatographic?purity | =<1.0? |