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Potentiometric detection of metal ions separated by liquid chromatography using a 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.1140091103
Subject(s) - potentiometric titration , chemistry , metal ions in aqueous solution , ethylenediamine , detection limit , chromatography , electroanalytical method , ion chromatography , ion , oxide , metal , inorganic chemistry , organic chemistry
The use of a tungsten oxide sensor for the potentiometric detection of metal ions separated by liquid chromatography is described. Separation of metal ions such as Fe 3+ , Fe 2+ , Cu 2+ and Pb 2+ was performed by ion chromatography using a mobile phase containing 25 mM sodium tartrate/2 mM ethylenediamine at pH 3.8. Calibration plots were linear in the range 0.5 to 3.5 mM. Potentiometric detection was also applied to ion‐interaction chromatography. The results showed that separation of metal ions was improved and the detection limits for the test metals in the range of 0.5–5 nmol were obtained in the presence of sodium citrate/1‐octanesulfonic acid at pH 3.0. The potentiometric detection described in this article is shown to have advantages in terms of low cost, simplicity and sensitivity.