Minimum assay (Arg.)..................................................................... 99,0 %

pH of 5% solution.......................................................................... 4,5-6,0

MAX. IMPURITIES

Insoluble matter in H2O................................................................. 0,005 %

Residue on ignition (as SO4)......................................................... 0,025 %

Iodine-reducing substances.................................................. 0,002 meq/g

Chloride (Cl).................................................................................. 0,005 %

Sulphate (SO4).............................................................................. 0,005 %

Sulphide (S).................................................................................. 0,001 %

Heavy metals (as Pb).................................................................. 0,0005 %

Cu............................................................................................... 0,0005 %

Fe................................................................................................ 0,0001 %

Ni................................................................................................ 0,0005 %

Pb............................................................................................... 0,0005 %