Optimization of a flow injection differential potentiometric system with two identical electrodes for the determination of calcium ion in water with improved sensitivity

The optimization of a flow-injection analysis (FIA) system for the determination of calcium ions in water is described. The system was modified with 2 calcium ion-selective electrodes placed in series. Comparison with an equivalent conventional potentiometric FIA system revealed an increased sensiti...

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Bibliographic Details
Published in:Analyst (London) 1997, Vol.122 (11), p.1435-1443
Main Authors: ALVARES-RIBEIRO, L. M. B. C, MACHADO, A. A. S. C
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
Online Access:Get full text
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Summary:The optimization of a flow-injection analysis (FIA) system for the determination of calcium ions in water is described. The system was modified with 2 calcium ion-selective electrodes placed in series. Comparison with an equivalent conventional potentiometric FIA system revealed an increased sensitivity of 28-50 mV per decade (in the response range of 0.001-0.1 mol per litre) and better reproducibility (0.5-0.8 per cent compared with 1.7-1.9 per cent). The influence of ionic strength to the process is discussed.
ISSN:0003-2654
1364-5528
DOI:10.1039/a703638h