1.High purity ferrous sulphate monohydrate 2.Fe>30%,Pb<20ppm,As<2ppm,Cd<5ppm 3.Certificated by ISO9001: ... and FAMI-QS 1.High purity ferrous sulphate monohydrate2.Fe>30%,Pb<20ppm,As<2ppm,Cd<5ppm3.Certificated by ISO9001:2008 ... : Powder or granularStandards:HG/2935-2006HS NO.: 28332910Purity: 91%Fe:30% Min Specification:ItemSpecificationFeSO4. H2O91% Min.Fe30% Min.Pb20 ppm Max ...