| 1 | Description | Colorless, transparent crystals, very efflorescent. | Colorless, transparent crystals, very efflorescent | USP/Ph.Eur/BP |
| 2 | Solubility | Complies | Freely soluble in water; practically insoluble in ethanol (96%) | USP/In-house |
| 3 | Identification (By chemical test) | Complies | Solution should be slightly alkaline | Ph.Eur/BP |
| 4 | Identification (By Loss on drying) | 60.6% | 57.0% -61.0% | USP/Ph.Eur/BP |
| 5 | Identification (Sodium) | Complies | A dense precipitate should form. | USP/Ph.Eur/BP |
| 6 | Identification (Phosphate 1) | Complies | A yellow precipitate soluble in 2N nitric acid and in 6 N ammonium hydroxide should form. | USP |
| 7 | Identification (Phosphate 2) | Complies | With ammonium molybdate solution, acidified solutions should yield a yellow precipitate which should soluble in 6N ammonium hydroxide. | USP |
| 8 | Identification (Phosphate 3) | Complies | A yellow color should develop. | Ph.Eur/BP |
| 9 | Assay (on dried basis) | 98.4% | 98.0% - 100.5% | USP |
| 10 | Assay | 102.2% | 98.5% - 102.5% | Ph.Eur/BP |
| 11 | Insoluble Substances | 0.02% | NMT 20mg (NMT 0.4%) | USP |
| 12 | Appearance of solution | Complies | Clear and colorless solution. | Ph.Eur/BP |
| 13 | Reducing substances | Complies | The color of the permanganate should not completely discharge | Ph.Eur/BP |
| 14 | Monosodium Phosphate | Less than 2.5% | NMT 2.5% | Ph.Eur/BP |
| 15 | Chlorides | Less than 200ppm | NMT 200ppm | Ph.Eur/BP |
| 16 | Sulphate (SO4) | Less than 500ppm | NMT 500ppm | Ph.Eur/BP |
| 17 | Arsenic (As) | Less than 2ppm | NMT 2ppm | Ph.Eur/BP |
| 18 | Iron(Fe) | Less than 20ppm | NMT 20ppm | Ph.Eur/BP |
| 19 | Loss on drying at 130°C | 60.6% | 57.0% -61.0% | USP/Ph.Eur/BP |
| 20 | Total aerobic microbial count | Less than 100 CFU/gm | NMT 100 CFU/gm | In House |
| 21 | Total combined yeast and mould count | Less than 10 CFU/gm | NMT 10 CFU/ gm | In House |
| 22 | Bacterial endotoxin test | Less than 2.5 EU/gm | NMT 2.5 EU/gm | In House |