K2CO3 M.W. 138.21 Assay(by acidimetry) min 99.0% Insoluble matter in water max 0.02% Loss on drying at 300oC max 3.0% Total Nitrogen(N) max 0.005% Chloride (Cl) max 0.01% Phosphate (PO4) max 0.005% Sulphate(as SO4) max 0.05% Aluminium (Al) max 0.005% Lead (as Pb) max 0.003% Arsenic(As) max 0.0003% Calcium(Ca) max 0.01% Copper (Cu) max 0.003% Iron(Fe) max 0.003% Magnesium(Mg) max 0.01% Nickel (Ni) max 0.003%