Phosphate Determination by Complexometric Back Titration
This application note (download below) contains the method and procedure tips for determination of phosphates in selected soft drink and mouthwash samples by complexometric back titration is used, where an excess of bismuth nitrate is added to the sample, bismuth phosphate is then precipitated and unreacted bismuth ions are titrated against EDTA. 4(2Pyridylazo)resorcinol (PAR) is