Items | Superior products | First Grade | Qualified products |
Mass fraction of ammonium chloride(NH4CL,On a dry basis)%≥ | 99.5 | 99.3 | 99.0 |
Mass fraction of water% ≤ | 0.5 | 0.7 | 1.0 |
Mass fraction of burning residue%≤ | 0.4 | 0.4 | 0.4 |
Mass fraction of iron(Fe)%≤ | 0.0007 | 0.0010 | 0.0030 |
Mass fraction of heavy metals(Pb)%≤ | 0.0005 | 0.0005 | 0.0010 |
Mass fraction of sulfate(So4)%≤ | 0.02 | 0.05 | --- |
PH value(200g/Lsolution) | 4.0-5.8 |
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