Application of the Bjerrum function to the potentiometric tritration of aluminum by fluoride ions

The theoretical grounds and analytical characteristics of two analytical methods, titration to a given potential and the linearized graph method, are compared using the titration of aluminum by fluoride ions in the presence of a LaF3 electrode as an example. It is shown that there is no fundamental difference between these two methods. The linearized graph method is simpler and more accurate than the titration to a given potential. An equation is proposed for processing the results obtained using the linearized graph. This equation eliminates systematic errors due to the retarded kinetics of complexation.