|
Molecular formula: (NH4)2SO4
Molecular weight: 132.14
CAS NO:7783-20-2
Properties: colorless crystal or semi-transparent powder. Relative density is 1.769. It breaks up into ammonia and ammonium bisulfate if heated to 100℃. Soluble in water, insoluble in ethyl alcohol and acetone.
Uses: as analytical reagent, precipitant, and masking agent.
Standard: maximum assay of impurities is in %
| Specification/item |
Analytically pure-AR |
Chemically pure-CP |
High pure |
|
Assay[(NH4)2SO4)] /% |
≥99.0 |
≥99.0 |
≥99.0 |
|
PH value(50g/L solution, 25℃) |
4.8~6.0 |
4.8~6.0 |
4.8~6.0 |
|
Clarity test |
Qualified |
Qualified |
Qualified |
|
Water insoluble matter/% |
≤0.002 |
≤0.01 |
≤0.005 |
|
Ignition residue (as sulfate) /% |
≤0.01 |
≤0.05 |
－ |
|
Chloride (Cl) /% |
≤0.000 5 |
≤0.001 |
≤0.001 |
|
Nitrate (NO3) /% |
≤0.001 |
≤0.005 |
－ |
|
Phosphate (PO4) /% |
≤0.0005 |
≤0.002 |
－ |
|
Arsenic (As) /% |
≤0.00002 |
≤0.0002 |
≤0.0003 |
|
Calcium (Ca) /% |
≤0.005 |
－ |
－ |
|
Iron (Fe) /% |
≤0.0002 |
≤0.0005 |
≤0.0005 |
|
Heavy metal (Pb) /% |
≤0.0005 |
≤0.002 |
≤0.0003 |
Packing: woven bag lined with plastic bag, kraft paper bag, or fiber drum, net weight is 25kg. |
