Determination of total phosphate in phosphoric acid and phosphate fertilizers with thermometric titration
AB-314
fr
Phosphate can be rapidly and easily titrated thermometrically using a standard solution of Mg2+ as titrant. The phosphate-containing solution is basified and buffered with NH3/NH4Cl solution before titration. The formation of insoluble MgNH4PO4 is exothermic. The method is a titrimetric adaptation of a classical gravimetric procedure. This bulletin deals with the determination of phosphate in phosphoric acid and granular fertilizers such as MAP (monoammonium phosphate), DAP (diammonium phosphate) and TSP (triple superphosphate). Results are reported as percentage of P and P2O5.
Phosphate can be rapidly and easily titrated thermometrically by adapting the classical gravimetric precipitation reaction with magnesium in the presence of ammonium. This reaction is exothermic and a Mg2+ standard solution can be used as titrant.
This Application Bulletin deals with the determination of phosphate in phosphoric acid and granular fertilizers such as MAP (monoammonium phosphate), DAP (diammonium phosphate), and TSP (triple superphosphate). Results are reported as percentage of P and P2O5.