Minimum assay.............................................................................. 99,5 %

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

MAX. IMPURITIES

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

Residue on ignition (as SO4)........................................................... 0,05 %

Chloride and bromide (as Cl)........................................................ 0,005 %

Phosphate (PO4)........................................................................... 0,001 %

Sulphate (SO4).............................................................................. 0,002 %

Heavy metals (as Pb).................................................................... 0,001 %

Ba................................................................................................. 0,002 %

Ca................................................................................................. 0,001 %

Cu............................................................................................... 0,0001 %

Fe................................................................................................ 0,0002 %

K................................................................................................... 0,002 %

Na................................................................................................. 0,002 %

Ni................................................................................................ 0,0001 %

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