Minimum assay (Perm.).................................................................. 99,5 %

pH of 5% solution.......................................................................... 2,5-4,0

MAX. IMPURITIES

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

Insoluble matter in C2H5OH.......................................................... 0,005 %

Residue on ignition (as SO4)........................................................... 0,01 %

Acidity...................................................................................... 0,25 meq/g

Sulphur compounds (as SO4)....................................................... 0,002 %

Ammonium (NH4)............................................................................ 0,05 %

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

As............................................................................................... 0,0001 %

Metals by ICP [mg/Kg (ppm)]

Bi...............................5

Cd..............................5

Co..............................5

Cr...............................5

Cu..............................5

Fe...............................5

Ga..............................5

Ge..............................5

In................................5

K..............................50

Mg.............................5

Mn.............................5

Na............................50

Ni...............................5

Pb..............................5

Sr...............................5

Tl................................5

V................................5

Zn..............................5

Zr...............................5