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Di-ammonium phosphate (DAP) also known as Di-ammonium hydrogen phosphate is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid until the desired PH is obtained. DAP produced gets settled down in the solution and then it is further centrifuged to obtain the crystalline powder of Di-ammonium phosphate.
| Sr. No | Parameters | Unit | Specified value |
|---|---|---|---|
| 1 | Appearance | Visual observation | A white crystalline powder |
| 2 | Solubility 10% solution | % w/v | Clear & colourless solution |
| 3 | pH of 5% solution | % w/v | 7.8 – 8.5 |
| 4 | Phosphate (as P2O5) | % w/w | Min. 52.0 % |
| 5 | Assay on dried basis | % w/w | Min. 99.0% |
| 6 | Chloride (as Cl) | % w/w | Max. 0.01% |
| 7 | Sulphate (as SO4) | % w/w | Max. 0.01% |
| 8 | Iron (as Fe) | % w/w | Max. 0.002 % |
| Sr. No | Parameters | Unit | Specified value |
|---|---|---|---|
| 1 | Appearance | Visual observation | An off white to white crystalline powder |
| 2 | Solubility 10% solution | % w/v | Freely soluble in water |
| 3 | pH of 5% solution | % w/v | 7.8 – 9.0 |
| 4 | Phosphate (as P2O5) | % w/w | Min. 46.0 % |
| 5 | Assay on dried basis | % w/w | Min. 90.0% |
| 6 | Iron (as Fe) | % w/w | Max. 0.005 % |
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