Items | Standard |
Appearance | White or almost white crystalline powder or colourless crystals |
Indentification | A:IR absorption; C:Reaction(a) of chlorides |
Appearance of solution | Clear,not more intense than Y7 or GY7 |
PH | 2.7~3.3 |
Water | ≤5.0% |
Sulphated ash | ≤0.1% |
Sulphates | ≤300ppm |
Impurity A | ≤0.15% |
Impurity B | ≤0.3% |
Impurity C | ≤0.15% |
Unspecified impurity | ≤0.10% |
Total impurities | ≤0.5% |
Assay(on anhydrous basis) | 98.5%~101.0% |