Assay (Iodom.) (as SO2) calc. a.a.s.........................................45,5-54,5 %
Identity according to Pharmacopoeias................................................ p/t.
pH of 2% solution........................................................................ 9,5-10,5
MAX. IMPURITIES
Clarity and appearance of solution...................................................... p/t.
Insoluble matter in H2O................................................................... 0,05 %
Loss on drying at 105°C................................................................. 27,0 %
Residual solvents (Ph.Eur./USP)........................................................... p/t.
Alkalinity.................................................................................. 0,35 meq/g
Sodium sulphite (as Na2SO3) calc. a.a.s........................................... 5,0 %
Sulphide............................................................................................... p/t.
Fe................................................................................................ 0,0025 %
Pb................................................................................................. 0,001 %
