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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)

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Abstract

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(lIl) 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.

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Authors and Affiliations

  1. Laboratory of Analytical Chemistry, Department of Chemistry, University of Tsukuba, Tsukuba, 305, Japan

    Kazuyuki Umetsu, Hideyuki Itabashi, Keiichi Satoh & Takuji Kawashima

Authors
  1. Kazuyuki Umetsu
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  2. Hideyuki Itabashi
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  3. Keiichi Satoh
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  4. Takuji Kawashima
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Umetsu, K., Itabashi, H., Satoh, K. et al. 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). ANAL. SCI. 7, 115–118 (1991). https://doi.org/10.2116/analsci.7.115

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  • DOI: https://doi.org/10.2116/analsci.7.115

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