Assay (Iodom.)(Na2S2O5)........................................................96,5-100,0%
Assay (Iodom.)(as SO2)...........................................................65,0-67,4 %
Identity according to Pharmacopoeias................................................ p/t.
pH of 5% solution.......................................................................... 3,5-5,0
MAX. IMPURITIES
Appearance of solution........................................................................ p/t.
Insoluble matter in H2O................................................................. 0,025 %
Residual solvents (Ph.Eur./USP)............................................................ p/t
Chloride (Cl).................................................................................... 0,02 %
Thiosulphate (S2O3)......................................................................... 0,05 %
Thiosulphate (BP)................................................................................. p/t.
Heavy metals (as Pb).................................................................... 0,002 %
As............................................................................................... 0,0003 %
Fe.................................................................................................. 0,002 %
Pb................................................................................................. 0,001 %
