Iron (II) sulfate heptahydrate Extra Pure 500 g

Assay 98.5-104.5%

pH (5% water) 3-4 Fe (III) salts (Fe) 0.2% Chloride (Cl) 0.01% Heavy metals (Pb) 0.005% Copper (Cu) 0.005% Manganese (Mn) 0.1% Arsenic (As) 0.0002% Lead (Pb) 0.001% Mercury (Hg) 0.0003% Zinc (Zn) 0.05%