1.ferrous sulphate heptahydrate 2.light green 3.factory supply competitive price 4.high quality 5.prompt delivery Ferrous sulphate Haptahydrate FeSO4.7H20 19.7%fe1,specification.Industry Grade Indexpurity 98.0%miniron(fe) 19.7%minlead(pb) 0.002%maxarsenic(As) 0.0002%max2, packingIndustrially, ferrous sulphate is mainly used as a precursor to other iron compounds, it is a reducing agent, for the ...