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Specificication:

FeSO4.H2O  91%min
Iron Minimum30% min
As             0.0002%max              
Pb             0.001%max              
Cd            0.0005%max      
Hg            0.00001%max
Insoluble material  0.2% max   
Mainly use of ferrous sulfate:
1.For flocculant , has the very good decoloring ability
2.Also used as food additives, fertilizer,pigment, electronic industrial raw materials, hydrogen sulphide deodorant, soil improver, industrial catalyst etc.