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The effect of complexing agents on the titration of vanadium(V) with iron(II) was studied. Complexing agents which form more stable complexes with iron(III) than iron(II) produce a sharper titration of vanadium(V) with Iron(II). Citrate, pyrophosphate and EDTA improve the potential break at the equivalence point. The presence of excess EDTA decreases the formal potential of the V(V)/V(IV) couple due to the formation of vanadium(V)-EDTA complexes. The use of a ligand buffer with zinc(II) in excess over EDTA is very effective for improving the end-point detection in the titration, preventing the formation of vanadium(V)-EDTA complexes.

analytical sciences

Effect of Ligands on the Redox Reaction of Metal Ions and the Use of a Ligand Buffer for Improving the End-Point Detection in the Potentiometric Titration of Vanadium(V) with Iron(II)