Abstract
Determination of pH using a typical glass electrode requires prior calibration in order to determine the electrode parameters. Knowledge about uncertainties of the parameters is insufficient to calculate the uncertainty of measured pH because of existing correlation. In the paper, an example illustrating the problem is presented. Two ways of proper uncertainty assessment are suggested: (1) analytical with removing the correlated variables and (2) numerical using Monte Carlo simulations. The second one seems to be much less time-consuming and allows easier investigations of the uncertainty properties.
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References
Sheppard, N.F.J., Guiseppi-Elie, A.: 71. pH Measurement. Electrical Engineering Handbook Series. In: The Measurement, Instrumentation, and Sensors: Handbook. Springer (1999)
Morf, W.E.: The Principles of Ion-Selective Electrodes and of Membrane Transport. Akadémiai Kiadó, Budapest (1981)
Cammann, K.: Working with ion-selective electrodes: chemical laboratory practice. Springer (1979)
Spitzer, P., Fisicaro, P., Meinrath, G., Stoica, D.: pH buffer assessment and Pitzer’s equations. Accreditation and Quality Assurance 16, 191–198 (2011)
Camões, M.F.: The quality of pH measurements 100 years after its definition. Accreditation and Quality Assurance 14, 521–523 (2009)
Midgley, D., Torrance, K.: Potentiometric Water Analysis, 2nd edn. John Wiley & Sons, Inc., Chichester (1991)
Bakker, E., Bühlmann, P., Pretsch, E.: The phase-boundary potential model. Talanta 62, 843–860 (2004)
IUPAC: Potentiometric selectivity coefficients of ion-selective electrodes. part I. inorganic cations (technical report). Pure Appl. Chem. 72(10), 1851–2082 (2000)
Kozyra, A., Wiora, J., Wiora, A.: Calibration of potentiometric sensor arrays with a reduced number of standards. Talanta 98, 28–33 (2012)
Sokalski, T., Lewenstam, A.: Application of Nernst-Planck and Poisson equations for interpretation of liquid-junction and membrane potentials in real-time and space domains. Electrochem. Commun. 3, 107–112 (2001)
Wiora, J., Wiora, A.: A system allowing for the automatic determination of the characteristic shapes of ion-selective electrodes. In: Pisarkiewicz, T. (ed.) Optoelectronic and Electronic Sensors VI, Zakopane, October. Proceedings of SPIE, vol. 6348 (October 2006)
Wiora, J.: About the uncertainty of concentration standards applied in the calibration of potentiometric ion-selective electrodes. Measurement Automation and Monitoring 54(5), 318–321 (2008) (in Polish)
JCGM: Evaluation of measurement data – Guide to the expression of uncertainty in measurement (2008)
JCGM: Evaluation of measurement data – Supplement 1 to the “Guide to the expression of uncertainty in measurement” – Propagation of distributions using a Monte Carlo method (2008)
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Wiora, J. (2015). Uncertainty Evaluation of pH Measured Using Potentiometric Method. In: Filev, D., et al. Intelligent Systems'2014. Advances in Intelligent Systems and Computing, vol 323. Springer, Cham. https://doi.org/10.1007/978-3-319-11310-4_45
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DOI: https://doi.org/10.1007/978-3-319-11310-4_45
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-11309-8
Online ISBN: 978-3-319-11310-4
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