Items | Standard |
Main content (NH4) 2HPO4 | ≥99% |
P2O5 Phosphorus Pentoxide | ≥53% |
Nitrogen, as N | ≥20.8% |
Moisture | ≤0.1% |
Heavy metals, as Pb | ≤0.001% |
SO4 | ≤ 0.5% |
Arsenic, as As | ≤0.0003% |
Fluoride | ≤ 10 ppm |
Water insoluble | ≤0.10% |
PH (1% water solution) | 7.8-8.2 |
Na2O | ≤0.001% |
K2O | ≤0.01% |
Density | 20--40 mesh |
Insoluble matter | NIL |
Any foreign particle | NIL |