... (as dry base),≥%98.098.0 P2O5 Content(Anhydrous basis) ,%--49.0-51.0Lead, ≤%0.00040.0004Water insoluble(Anhydrous basis),≤%0.20.2Fluoride, ≤%0.0050.001Loss ... ≤22.0%3,Heptahydrate ≤50.0%4,Dodecahydrate ≤61.0%(40°C,3h then 105°C,5h))As,≤%0.00030.0003Cadmium ≤%--0.0001Mercury ≤%--0.0001 disodium phosphate