We have good Quality Supply of Ferrous Sulphate from India Product Specification Ferrous Sulphate - (FeSO47H2) Test Solution - (10%w/v in water + 1ml sulphuric acid) Solution is clear and bluish-green Assay as FeSO4.7H2O, min - 99.0% pH value (5% Solution) - 3.0 â?? 4.0 Maximum limit of Impurity : Chloride as Cl - 0.0005% Heavy Metals as Pb - 0.0001% Copper as Cu - 0.001% Ferric as Fe+3 - 0.05% Arsenic as As - 0.00004% Nitrogen as N - 0.001% Phosphate as PO4 - 0.001% Sodium as Na - 0.02% Calcium as Ca - 0.005% Magnesium as Mg - 0.005% Manganese as Mn - 0.05% Potassium as K - 0.002% Zinc as Zn - 0.001% Commercial also available.