SDS Volume (2994)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Slack, A. V.; Hatfield, J. D.; Shaffer, H. B.; Driskell, J. C.; J. Agr. Food Chem. 1959, 7, 404.
Variables:
Room Temp: Composition at 271.5 with the mole ratio CO(NH2)2/NH4NO3 = 1.065 $\pu{K}$
Prepared by:
Method/Apparatus/Procedure:
A series of solutions of each ratio, differing by small increments of water content, were cooled to $\pu{\pm 1.5 °C}$, and each solution (about 50 ml) was seeded with about 50 mg of crystals. The mixtures were agitated mildly for about 3 days. The disappearance or growth of crystals in the samples in this period permitted determination of the solubility.
Source and Purity of Materials:
- All the salts used were reagent grade. The water was deionized.
Estimated Errors:
Ambient temperature: The temperature was kept constant to within -1.5 ±0.7°C. The solubility was determined within 0.1 to 0.2% of the plant nutrient.
Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Urea, $\ce{ CH4N2O }$; [57-13-6] NIST WebBook
- Ammonium nitrate, $\ce{ NH4NO3 }$; [6484-52-2] NIST WebBook
- Potassium chloride, $\ce{ KCl }$; [7447-40-7] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility (expressed as N + P2O5 + K2O) in the NH4H2PO4-(NH4)2HPO4-CO(NH2)2-NH4NO3-KCl-H2O system at 271.5 K with the mol ratio CO(NH2)2/NH4NO3 = 1.065.
| Nutrient ratio | $R_{1/2}$ | g1/100 g solute (g1/100 g2) |
|---|---|---|
| 1-3-0 | 1.5 | 33.7 |
| 1-3-0 | 1.6 | 32.9 |
| 1-3-0 | 1.7 | 33.9 |
| 1-2-0 | 1.5 | 31.3 |
| 1-2-0 | 1.6 | 30.5 |
| 1-2-0 | 1.7 | 30.5 |
| 1-1-0 | 1.5 | 28.0 |
| 1-1-0 | 1.6 | 27.5 |
| 1-1-0 | 1.7 | 36.9 |
| 2-1-0 | 1.5 | 26.9 |
| 2-1-0 | 1.6 | 25.7 |
| 2-1-0 | 1.7 | 23.7 |
| 1-3-1 | 1.5 | 32.1 |
| 1-3-1 | 1.6 | 34.1 |
| 1-3-1 | 1.7 | 31.9 |
| 1-2-1 | 1.5 | 29.1 |
| 1-2-1 | 1.6 | 29.5 |
| 1-2-1 | 1.7 | 30.1 |
| 1-1-1 | 1.5 | 20.5 |
| 1-1-1 | 1.6 | 20.7 |
| 1-1-1 | 1.7 | 21.3 |
| 2-1-2 | 1.5 | 16.7 |
| 2-1-2 | 1.6 | 16.5 |
| 2-1-2 | 1.7 | 16.5 |
| 1-3-3 | 1.5 | 24.5 |
| 1-3-3 | 1.6 | 24.6 |
| 1-3-3 | 1.7 | 24.3 |
| 1-2-3 | 1.5 | 22.7 |
| 1-2-3 | 1.6 | 22.3 |
| 1-2-3 | 1.7 | 22.3 |
| 1-1-3 | 1.5 | 19.9 |
| 1-1-3 | 1.6 | 19.7 |
| 1-1-3 | 1.7 | 19.9 |
| 2-1-6 | 1.5 | 18.1 |
| 2-1-6 | 1.6 | 18.3 |
| 2-1-6 | 1.7 | 18.3 |
(a) The nutrient ratio is the weight ratio N:P2O5:K2O.
(b) NH4H2PO4 is the solid phase in equilibrium with the above solution.
(c) (NH4)2HPO4 is the solid phase in equilibrium with the above solution.
(d) KNO3 is the solid phase in equilibrium with the above solution.
(e) KCl is the solid phase in equilibrium with the above solution.
