1 | Appearance | White crystalline powder. | White or almost white, crystalline powder or colourless crystals or white or almost white pearls. |
2 | Solubility | Complies | Freely soluble in water, practically insoluble in anhydrous ethanol. |
3 | Identification A (Chloride) | Complies | A white curdled precipitate should form which should dissolve in ammonia |
4 | Identification B (Sodium) | Complies | A dense white precipitate should form |
5 | Appearance of Solution | Complies | Clear and colorless solution |
6 | Acidity & alkalinity | Complies | Not more than 0.5ml of 0.01M hydrochloric acid or 0.01M sodium hydroxide should require to change the colour of the indicator. |
7 | Bromide (Br) | Less than 100ppm | 100ppm max |
8 | Ferrocyanide[Fe(CN6)] | Complies | No blue colour should produce within 10 minutes. |
9 | Iodide(I) | Complies | The mixture shows no blue colour. |
10 | Nitrite (NO2) | 0.004 | The absorbance should not be greater than 0.01 at 354 nm |
11 | Phosphate (PO4) | Less than 25ppm | 25ppm max |
12 | Sulfate (SO4) | Less than 200ppm | 200ppm max |
13 | Arsenic (As) | Less than 1ppm | 1ppm max |
14 | Barium(Ba) | Complies | Any opalescence in the solution should not more intense than that of reference solution. |
15 | Iron (Fe) | Less than 2ppm | 2ppm max |
16 | Magnesium and alkaline earth metals | 35ppm | 100ppm max |
17 | Loss on drying,105°C | 0.3% | 0.5% max |
18 | Assay (Dried substance) | 99.8% | 99.0% - 100.5% |