molecular formula: znso4·7h2o
molecular weight: 287.54
cas no:7733-02-0
properties: colorless crystal. relative density is 1.957. easily soluble in water, insoluble in ethyl alcohol.
uses: analytical reagent, mordant, electronic component production and pharmaceutical industry.
standard: maximum assay of impurities is in %
specification/item |
analytically pure-ar
|
chemically pure-cp
|
high pure
|
assay
|
≥99.5
|
≥99.0
|
≥99
|
clarity test
|
qualified
|
qualified
|
—
|
ph value
|
4.4-6.0
|
4.4-6.0
|
4.4-6.0
|
water insoluble matter
|
≤0.01
|
≤0.01
|
≤0.02
|
chloride (cl)
|
≤0.0005
|
≤0.002
|
≤0.05
|
total nitrogen (n)
|
≤0.001
|
≤0.002
|
≤0.05
|
arsenic (as)
|
≤0.00005
|
≤0.0002
|
≤0.0002
|
manganese (mn)
|
≤0.0003
|
≤0.001
|
-
|
iron (fe)
|
≤0.0005
|
≤0.002
|
≤0.002
|
copper (cu)
|
≤0.001
|
≤0.005
|
-
|
cadmium (cd)
|
≤0.0005
|
≤0.002
|
-
|
lead (pb)
|
≤0.001
|
≤0.01
|
≤0.01
|
non-sludging to ammonium sulfide (as sulfate)
|
≤0.05
|
≤0.02
|
≤0.05
|
packing: woven bag lined with plastic bag, kraft paper bag, or fiber drum, net weight is 25kg.
|