|
molecular formula: (nh4)2hpo4
molecular weight: 132.06
properties: white crystal or powder with ammoniacal odor. relative density is 1.619 and melting point is 155℃. soluble in water and insoluble in alcohol.
uses: as analytical reagent, ph buffer agent, precipitant, corrosion inhibitor, and etc.
standard:
| specifications/item |
ar
|
cp
|
food grade
|
industrial high purity
|
|
assay[(nh4)2hpo4] /%
|
≥99.0
|
≥98.0
|
97.0~102.0
|
nitrogen (n) assay
20.0
|
|
ph value (50g/l,25℃)
|
7.8~8.2
|
7.8~8.2
|
7.8~8.2
|
7.8~8.2
|
|
clarity test
|
qualified
|
qualified
|
－
|
－
|
|
water insoluble matter/%
|
≤0.005
|
≤0.01
|
－
|
－
|
|
chloride(cl) /%
|
≤0.000 5
|
≤0.004
|
≤0.03
|
－
|
|
sulfur compound(so4) /%
|
≤0.005
|
≤0.01
|
－
|
－
|
|
nitrate(no3) /%
|
≤0.000 5
|
≤0.001
|
－
|
－
|
|
sodium (na) /%
|
≤0.01
|
≤0.02
|
－
|
－
|
|
potassium (k) /%
|
≤0.005
|
≤0.01
|
－
|
－
|
|
iron (fe) /%
|
≤0.000 5
|
≤0.002
|
－
|
－
|
|
arsenic (as) /%
|
≤0.000 5
|
≤0.002
|
≤0.000 4
|
－
|
|
heavy metal (pb) /%
|
≤0.000 5
|
≤0.001
|
≤0.002
|
－
|
|
phosphorus pentoxide (p2o5) /%
|
－
|
－
|
－
|
≤46.0
|
|
moisture/%
|
－
|
－
|
－
|
≤0.2
|
packing: plastic woven bag lined with plastic bag, kraft bag, carton or fiber drum, net weight is 25kg.
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