Assay (as C7H5O2Na) calc. on the dry basis..........................99,5-100,5%

Arsenic (as As), not more than........................................................ 3 ppm

Loss on drying, not more than......................................................... 1,5 %

Heavy metals (as Pb), not more than............................................ 10 ppm

Lead, not more than........................................................................ 2 ppm

Polycyclic acids.................................................................................... p/t.

Acidity and alkalinity............................................................................. p/t.

Alkalinity (as NaOH), not more than............................................... 0,04 %

Easily oxidable substances.................................................................. p/t.

Organic Chlorine (as monochlorobenz. acid), not more than......... 0,25 %

Water, not more than........................................................................ 1,5 %

Mercury (Hg), not more than........................................................... 1 ppm