| 1 | Appearance/Description | White powder that readily absorbs moisture. | White or almost White powder that readily absorbs moisture. | USP/Ph.Eur/BP |
| 2 | Solubility | Complies | Freely soluble in water; insoluble in alcohol (ethanol 96%) | USP/Ph.Eur/BP |
| 3 | Identification (By chemical test) | Complies | Solution should slightly alkaline. | Ph.Eur/BP |
| 4 | Identification (By Loss on drying) | 0.4% | NMT 1.0% | Ph.Eur/BP |
| 5 | Identification (Sodium) | Complies | A dense precipitate should form. | USP/Ph.Eur/BP |
| 6 | Identification (Phosphate 1) | Complies | With silver nitrate solution neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide. | USP |
| 7 | Identification (Phosphate 2) | Complies | With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide. | USP |
| 8 | Identification (Phosphate 3) | Complies | A yellow colour should develop | Ph.Eur/BP |
| 9 | Assay (on dry basis) | 99.9% | 98.0% - 100.5% | USP |
| 10 | Assay (Dried substance) | 100.0% | 98.0% - 101.0% | Ph.Eur/BP |
| 11 | Monosodium Phosphate | Less than 2.5% | NMT 2.5% | Ph.Eur/BP |
| 12 | Insoluble Substances | 0.1% | NMT 20 mg (NMT 0.4%) | USP |
| 13 | Appearance of solution | Complies | Solution should be clear and colourless. | Ph.Eur/BP |
| 14 | Chlorides | Less than 200 ppm | NMT 200 ppm | Ph.Eur/BP |
| 15 | Sulphate (SO4) | Less than 500 ppm | NMT 500 ppm | Ph.Eur/BP |
| 16 | Arsenic (As) | Less than 16 ppm | NMT 16ppm | USP |
| 17 | Reducing substances | Complies | The colour of the permanganate should not be completely discharge. | Ph.Eur/BP |
| 18 | Iron(Fe) | Less than 20 ppm | NMT 20 ppm | Ph.Eur/BP |
| 19 | Loss on drying | 0.4% | NMT 1.0% | Ph.Eur/BP |
| 20 | Total aerobic microbial count | Less than 100 CFU/gm | NMT 100 CFU/gm | In-house |
| 21 | Total combined yeast and molds count | Less than 10 CFU/gm | NMT 10 CFU/gm | In-house |
| 22 | E.coli | Absent/gm | Should be absent /gm | In-house |
| 23 | Salmonella | Absent/10 gm | Should be absent /10 gm | In-house |
| 24 | Pseud. aeruginosa | Absent/gm | Should be absent /gm | In-house |
| 25 | Staphylococcus aureus | Absent/gm | Should be absent /gm | In-house |
| 26 | Bile-tolerant gram negative bacteria | Absent/gm | Should be absent /gm | In-house |
| 27 | Bacterial endotoxins | Less than 2.5 EU/gm | NMT 2.5 EU/gm | In-house |