| INDEX | SPECIFICATION |
| Appearance | White or nearly white powder |
| Purity (dry basis, %) | 98- 100.5 |
| Moisture (%) | 8.5- 10.0 |
| Chloride (as Cl, %) | =< 0.011 |
| Alkalinity (%) | Qualified |
| Lead | =<2 mg/kg |
| Arsenic | =<3 mg/kg |
| Mercury | =<1 mg/kg |
| Cadmium | =<1 mg/kg |
| Total heavy metals (as Pb) | <10 mg/kg |