Factors Affecting the Potentiometric Response of All-Solid-State Solvent Polymeric Membrane Calcium-Selective Electrode for Low-Level Measurements

An all-solid-state calcium-selective electrode was constructed with poly(pyrrole) solid-contact doped with calcium complexing ligand Tiron. The potentiometric response of this sensor can have a linear range down to 10-9 M with a slope close to Nernstian and detection limit equal to 10-9.6. The effec...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2004-11, Vol.76 (21), p.6410-6418
Main Authors: Konopka, Anna, Sokalski, Tomasz, Michalska, Agata, Lewenstam, Andrzej, Maj-Zurawska, Magdalena
Format: Article
Language:English
Subjects:
Analytical chemistry
Calcium - analysis
Chemistry
Electrochemical methods
Electrodes
Exact sciences and technology
Potentiometry - instrumentation
Potentiometry - methods
Reproducibility of Results
Sensitivity and Specificity
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Summary:An all-solid-state calcium-selective electrode was constructed with poly(pyrrole) solid-contact doped with calcium complexing ligand Tiron. The potentiometric response of this sensor can have a linear range down to 10-9 M with a slope close to Nernstian and detection limit equal to 10-9.6. The effects of pH and the activity of the interfering ion in the conditioning solution on the potentiometric behavior of the constructed sensors were examined. Potential stability, reproducibility, and impedance studies were performed. The selectivity of the constructed electrode is better than that of the conventional calcium-selective electrode with internal filling solution of 10-2 M CaCl2 and comparable to that of the best liquid-contact electrodes.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac0492158