|
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. |