molecular formula: nah2po4·2h2o
molecular weight: 156.01
cas no: 13472-35-0
properties: colorless rhombic crystal. relative density is 2.040 and melting point is 60℃. soluble in water and insoluble in alcohol.
uses: as analytical reagent and buffer agent. it can be used in preparing bacteria culture medium, in food, fermentation, leather, boiler water, and other industries.
standard: the maximum content of impurities is in percentage content
specifications/item |
analytically pure-ar
|
chemically pure-cp
|
high purity
|
assay(nah2po4·2h2o)/%
|
≥99.0
|
≥98.0
|
≥98.0
|
ph value (50g/l,25℃)
|
4.2~4.6
|
4.2~4.6
|
4.2~4.6
|
clarity test
|
qualified
|
qualified
|
-
|
water insoluble matter
|
≤0.01
|
≤0.02
|
≤0.05
|
chloride(cl)
|
≤0.005
|
≤0.01
|
≤0.014
|
sulfate(so4)
|
≤0.005
|
≤0.01
|
≤0.25
|
nitrate(no3)
|
≤0.001
|
≤0.002
|
-
|
ammonium (nh4)
|
≤0.002
|
-
|
-
|
potassium (k)
|
≤0.02
|
≤0.1
|
-
|
iron (fe)
|
≤0.001
|
≤0.005
|
-
|
arsenic (as)
|
≤0.0002
|
≤0.0005
|
≤0.005
|
heavy metal (pb)
|
≤0.001
|
≤0.005
|
≤0.002
|
ammonia precipitate/%
|
≤0.01
|
≤0.02
|
-
|
fluoride(f) /%
|
-
|
-
|
≤0.005
|
packing: woven bag lined with plastic bag, kraft bag, or fiber drum, net weight is 25kg.
|