Multianalyte detection using potentiometric ionophore-based ion-selective electrodes

[Display omitted] •Multiion detection using a single potentiometric selective electrode is demonstrated.•The complexity of the obtained raw signals (potential vs. time) is reduced by PCA.•Smoothing of the raw signals is achieved by an appropriate reconstruction.•A powerful tool for the qualitative/q...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-05, Vol.243, p.144-151
Main Authors: Cuartero, M., Ruiz, A., Oliva, D.J., Ortuño, J.A.
Format: Article
Language:English
Subjects:
Alkaline and alkaline-earth ions
Binary mixtures
Cations
Electrical measurement
Electrodes
Experiments
Ion detectors
Ions
Potentiometric analysis
Potentiometry
Principal component analysis
Principal component regression
Principal components analysis
Qualitative analysis
Quantitative analysis
Transient signals
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Summary:[Display omitted] •Multiion detection using a single potentiometric selective electrode is demonstrated.•The complexity of the obtained raw signals (potential vs. time) is reduced by PCA.•Smoothing of the raw signals is achieved by an appropriate reconstruction.•A powerful tool for the qualitative/quantitative analysis of individual and mixed ion samples. This paper reports on the capability to detect multiple ions in mixed solutions using the tandem Dynamic Potentiometry-Principal Component Analysis. The treatment of potentiometric transient signals obtained by a single ion-selective electrode based on 18-crown-6 in a flow configuration serves for ion identification as well as quantification in binary mixtures. As a proof-of-concept alkaline, alkaline-earth, proton and ammonium cations are analysed. The developed procedure provides three exploitation points of the raw signals: (i) the complexity grade of the signals is drastically reduced, (ii) the total reconstruction of the experimental signals leads to less noisy ones, and (iii) the relationship found between the principal component scores with both increasing cation concentration (individual and binary mixtures) and type of cation is useful for qualitative and quantitative analysis. Multi-ion detection is currently a valuable characteristic for an analytical technique and the present paper provides a new approach involving the use of only one potentiometric sensor to achieve this purpose.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.11.129