... ,Formula wt: anhydrous 141.96; Formula wt, dihydrate 177.993,CAS: anhydrous [7558-79-4]; CAS: dihydrate [10028-24-7]5,Specificity: Colorless crystal, easily ... of indexFCC-VE339(ii)pH of a 1 % solution--8.4—9.6Content(as dry base),≥%98.098.0 P2O5 Content ... ≤50.0%4,Dodecahydrate ≤61.0%(40°C,3h then 105°C,5h))As,≤%0.00030.0003Cadmium ≤%--0.0001Mercury ≤%--0.0001 disodium phosphate