|
Molecular formula: ZnSO4.7H2O
|
Item
|
Index
|
internal control enterprise standard
|
|
II category
|
|
superior
|
top grade
|
qualified
|
|
Main content
|
(Zn)content, %
|
22.51
|
22.06
|
20.92
|
22.6
|
|
(ZnSO4 .7H2O)content, % ≥
|
99
|
97
|
92
|
99.4
|
|
internal control content, % ≤
|
0.02
|
0.05
|
0.1
|
0.01
|
|
PH range ≥
|
3
|
3
|
—
|
3.5
|
|
Pb content, % ≤
|
0.001
|
0.01
|
0.01
|
0.0005
|
|
Fe content, % ≤
|
0.003
|
0.02
|
0.06
|
0.001
|
|
Mn content, % ≤
|
0.005
|
0.1
|
—
|
0.001
|
|
Cd content, % ≤
|
0.001
|
0.01
|
—
|
0.0005
|
|
