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Colourimetric characterisation of disposable optical sensors from spectroradiometric measurements

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Abstract

Spectroradiometric measurements of reflectance and CIELAB hue-angle, were tested for K(I) determination using disposable optical sensors based on ion exchange mechanism. The linearisation of the sigmoidal response function, using a logistic regression, increases the linear range noticeably to 7.65 × 10−8–1.5 M and 1.22 × 10−7–1.5 M for CIELAB hue-angle and reflectance, respectively. The trueness of both procedures was demonstrated comparing it with results obtained by a DAD spectrophotometer used as a reference measurement procedure. The usefulness of the procedure was checked by analysing K(I) in different types of waters and beverages. Additionally, we studied the possible visual discrimination for the whole potassium range tested, obtaining the possibility of discriminating twelve groups of concentrations.

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Acknowledgements

We acknowledge financial support from Ministerio de Educación y Ciencia, Dirección General de Enseñanza Superior (Spain) (Projects CTQ2005-09060-CO2-01 and FIS2007-64266 co-financed the last one with FEDER; and Junta de Andalucía, Proyecto de Excelencia P06-FQM-01467).

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Authors and Affiliations

  1. Solid Phase Spectrometry Research Group, Department of Analytical Chemistry, Campus Fuentenueva, Faculty of Sciences, University of Granada, 18071, Granada, Spain

    A. Lapresta-Fernández & L. F. Capitán-Vallvey

  2. Department of Optics, Campus Fuentenueva, Faculty of Sciences, University of Granada, 18071, Granada, Spain

    R. Huertas & M. Melgosa

Authors
  1. A. Lapresta-Fernández
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  2. R. Huertas
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  3. M. Melgosa
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  4. L. F. Capitán-Vallvey
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Correspondence to L. F. Capitán-Vallvey.

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Lapresta-Fernández, A., Huertas, R., Melgosa, M. et al. Colourimetric characterisation of disposable optical sensors from spectroradiometric measurements. Anal Bioanal Chem 393, 1361–1366 (2009). https://doi.org/10.1007/s00216-008-2552-4

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  • DOI: https://doi.org/10.1007/s00216-008-2552-4

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