... (Na2HPO4),≥%Assay(Na2HPO4),≥%98.0(As),≤%As,≤%0.0003(Pb),≤%Heavy Metal(Pb),≤%0.001,≤%Fluoride,≤%0.005,≤%Insoluble in water,≤%0.2Loss on dryingNa2HPO4 ... ,≤%Na2HPO4·2H2O,%Na2HPO4·12H2O,≤%5.018.0-22.061.0:,.(Except loss on drying,others are measured as dry basis disodium phosphate