Assay (Iodom.)(as K2S2O5)........................................................95,0-100 %
Identity according to Pharmacopoeias................................................ p/t.
pH of 5% solution.......................................................................... 3,0-4,5
MAX. IMPURITIES
Appearance of solution........................................................................ p/t.
Insoluble matter in H2O................................................................. 0,025 %
Residual solvents (Ph.Eur./USP)............................................................ p/t
Chloride (Cl).................................................................................. 0,025 %
Phosphate (PO4)........................................................................... 0,001 %
Thiosulphate (S2O3)............................................................................... p/t.
Heavy metals (as Pb).................................................................... 0,001 %
As............................................................................................... 0,0003 %
Fe.................................................................................................. 0,001 %
Se................................................................................................. 0,001 %
Zn............................................................................................... 0,0025 %
