1 | Description | White,odorless, hygroscopic, crystlline powder. | White, odorless or almost odorless, hygroscopic, crystalline powder. |
2 | Solubility | Passes | Freely soluble in water; slightly soluble in methanol; practically insoluble in acetone, in dehydrated alcohol, and in benzene. |
3 | Identification by Chemical test | Complies | Meets the requirements |
4 | Assay (Anhydrous basis) | 99.34% | 99.0% - 100.5% |
5 | Arsenic(As) | NMT 3ppm | Not more than 3ppm |
6 | Chloride(Cl) | NMT0.05% | 0.05% max. |
7 | Sulphate(SO4) | NMT 0.06% | 0.06% max. |
8 | Heavy metals | NMT 25ppm | Not more than 25ppm |
9 | Lead (Pb) | NMT 10ppm | Not more than 10ppm |
10 | Fluoride(F) | NMT 50ppm | 50ppm max. |
11 | Nitrate(NO3) | Passes | The blue color persists for NLT 10 min. |
12 | Readily oxidizable substances | Passes | The pink color in the supernatant is not completely discharged. |
13 | pH | 7.18 | 6.3 - 9.6 |
14 | Water | 5.92% | Not more than 7.0% |