1 | Description | White crystalline powder. | Colorless, cubic crystals or white crystalline powder. |
2 | Solubility | Complies | Freely soluble in water and slightly more soluble in boiling water; soluble in glycerin;slightly soluble in alcohol. |
3 | Appearance of solution | Complies | The solution is clear and colorless. |
4 | Acidity or alkalinity | Complies | NMT 0.5ml of 0.01N hydrochloric acid or 0.01N sodium hydroxide is required to change the color of this solution. |
5 | Arsenic (As) | Less than 1ppm | Not more than 1ppm |
6 | Barium(Ba) | Complies | The solutions are equally clear after standing for 2 Hrs. |
7 | Limit of bromides | Less than 100ppm | Not more than 100ppm |
8 | Calcium(Ca)&Magnesium(Mg) | Less than 50ppm | Not more than 50ppm (calculated as Ca) |
9 | Ferrocyanide[Fe(CN6)] | Complies | No blue color develops in 10min. |
10 | Heavy metals | Less than 5ppm | Not more than 5ppm |
11 | Iodides (I) | Complies | No blue color is observed. |
12 | Iron(Fe) | Less than 2ppm | Not more than 2ppm |
13 | Sulphate(SO4) | Less than 200ppm | Not more than 200ppm |
14 | Loss on drying,105°C | 0.3% | Not more than 0.5% |
15 | Assay (on dry basis) | 99.81% | 99.00%-100.50% |
16 | Potassium(K) | 190ppm | Not more than 500ppm |
17 | Nitrite (NO2) | 0.004 | Absorbance is not more than 0.01 |
18 | Limit of phosphates | Less than 25ppm | Not more than 25ppm |
19 | Identification A (By Chemical test) | Complies | Positive test for sodium |
20 | Identification B (By Chemical test) | Complies | Positive test for chloride |