Assay min 98.0%Substances insoluble in acetic acid max 0.2%Substances insoluble in HCl max 0.2%Chloride(Cl) max 0.025%Sulphate(SO4) max 0.25%Heavy metals(as Pb) max 0.002%Lead(Pb) max 0.001%Copper(Cu) max 0.001%Zinc(Zn) max 0.001%Iron(Fe) max 0.02...
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