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Flow‐injection potentiometric detection of metal ions based on tungsten oxide electrode
Author(s) -
Chen Zuliang,
Alexander Peter W.
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140090210
Subject(s) - potentiometric titration , electrode , metal ions in aqueous solution , tungsten , oxide , ion , flow injection analysis , inorganic chemistry , chemistry , metal , detection limit , tungsten oxide , analytical chemistry (journal) , chelation , reproducibility , electroanalytical method , linear range , chromatography , organic chemistry
The use of a tungsten oxide electrode for potentiometric flow‐injection analysis of transition metal ions is described. The effect of a variety of experimental conditions, including the carrier pH, the types of ligands and their concentrations, was studied. It was found that the best sensitivity for the ions tested was obtained using EDTA as a ligand. The electrode exhibited a linear response for Fe 3+ , Cu 2+ , Pb 2+ and Ca 2+ in the range of 2.5 × 10 −4 M to 2 × 10 −3 M using with 1 × 10 −3 M EDTA at pH 5.0 as carrier. The detection limits were found to be between 1 × 10 −5 to 5 × 10 −5 M. Reproducibility for Fe 3+ was about 1.7% with a stable baseline potential.