Assay (Iodom.) (as K2S2O3).................................................................96 %
pH of 5% solution................................................................................ 6-9
Insoluble matter in H2O................................................................... 0,02 %
Loss on drying at 150°C...................................................................2-4 %
Chloride (Cl).................................................................................... 0,05 %
Heavy metals (as Pb).................................................................... 0,001 %
Fe.................................................................................................. 0,001 %
