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Items | Unit | STANDARD | |
---|---|---|---|
Content | (NH4)2SO4 | % ≥ | 98.00 |
N | % ≥ | 21.00 | |
Free acid | HCl | % ≤ | 0.300 |
Moisture | H2O | % ≤ | 0.050 |
Iron | Fe | % ≤ | 0.007 |
Arsnic | As | % ≤ | 0.005 |
Heavy metal | Pb | % ≤ | 0.005 |
PH | --- | 5.500 | |
Water insoluble matter | % ≤ | 0.010 |