On the possibilities of potentiometric analysis in presence of small concentrations of highly interfering foreign ions: Ways for reducing the interference

The influence of a series of easily controlled factors on the results of direct potentiometric determination of target ions in presence of small concentrations of highly interfering foreign ions is investigated using digital simulation in the framework of the recently proposed interface equilibria-t...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2019-08, Vol.847, p.113234, Article 113234
Main Authors: Egorov, Vladimir V., Novakovskii, Andrei D.
Format: Article
Language:English
Subjects:
Boundary potential
Computer simulation
Digital simulation
Dilution
Dynamic diffusion model
Interference
Ion exchangers
Potentiometric analysis
Potentiometry
Practical selectivity
Selectivity
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Summary:The influence of a series of easily controlled factors on the results of direct potentiometric determination of target ions in presence of small concentrations of highly interfering foreign ions is investigated using digital simulation in the framework of the recently proposed interface equilibria-triggered dynamic diffusion model. It was shown that targeted control of such factors of influence as the dilution of the sample solution, the rate of stirring, the concentration of the ion exchanger and the ratio of polymer to plasticizer in the membrane, as well as the measuring time, allows reducing the influence of foreign ions for several decimal orders. The results of the calculations are in good agreement with experimental data that makes it possible to reveal, on the basis of simulation results, the key factors of influence on the practical selectivity of the electrode and to propose rational ways for optimizing the membrane composition and the experimental conditions in order to reduce the influence of highly lipophilic foreign ions on the results of direct potentiometric determination. [Display omitted] •Influence of lipophilic ions on the electrode potential can be greatly reduced.•Key factors influencing the practical selectivity of the electrode are revealed.•The observed effects are described using dynamic diffusion model.•The theoretical predictions agree well with the experimental data.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.113234