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

Identity..............................................................................................IR p/t.

Melting range............................................................................ 258-263°C

T.L.C..................................................................................................... p/t.

MAX. IMPURITIES

pH transition interval:

colourless..............................................................................................8,0

red-violet.............................................................................................10,0

Transition interval acc. to ACS............................................................. p/t.

Insoluble matter in C2H5OH.................................................................. p/t.

Loss on drying at 105°C................................................................... 1,0 %

Residue on ignition (as SO4)............................................................. 0,1 %

As............................................................................................... 0,0002 %

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

Fe.................................................................................................. 0,005 %

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

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