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An IUPAC-based approach to estimate the detection limit in co-extraction-based optical sensors for anions with sigmoidal response calibration curves

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Abstract

An approach based on IUPAC methodology to estimate the limit of detection of bulk optode-based analytical methods for anions has been developed. The traditional IUPAC methodology for calculating the detection limit was modified to be adapted to particular cases where the calibration curves have a sigmoidal profile. Starting from the different full theoretical models for every co-extraction mechanism of the analyte in the membrane in bulk optodes, several particular simplified models at low analyte concentration were obtained and validated. The slope of the calibration curve at low analyte concentration was calculated from the first derivative of the simplified equation and, subsequently, the detection limit was estimated. This fitted-for-purpose estimation strategy was applied to anion quantification for in-house bulk optode-based analytical methods, and the estimated limits of detection were compared with those obtained by applying classical geometrical methodology. This way of establishing the detection limit yields values that maintain their true statistical and probabilistic aspects. It can be easily applied to any analytical system which yields non-linear calibration curves at low analyte concentration.

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Acknowledgments

We acknowledge financial support from the Ministerio de Ciencia e Innovación (Spain) (projects CTQ2009-14428-C02-01 and CTQ2009-14428-C02-02) and the Junta de Andalucia (project P08-FQM-3535). These projects have been partially supported by European Regional Development Funds.

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Authors and Affiliations

  1. Department of Analytical Chemistry, University of Granada, 18071, Granada, Spain

    M. D. Fernández-Ramos, L. Cuadros-Rodríguez & L. F. Capitán-Vallvey

  2. Central Laboratory of Animal Health Service, Department of the Environment, Rural and Marine Affairs, Camino del Jau s/n, Santa Fe, 18320, Granada, Spain

    E. Arroyo-Guerrero

Authors
  1. M. D. Fernández-Ramos
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  2. L. Cuadros-Rodríguez
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  3. E. Arroyo-Guerrero
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  4. L. F. Capitán-Vallvey
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Corresponding author

Correspondence to M. D. Fernández-Ramos.

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Fernández-Ramos, M.D., Cuadros-Rodríguez, L., Arroyo-Guerrero, E. et al. An IUPAC-based approach to estimate the detection limit in co-extraction-based optical sensors for anions with sigmoidal response calibration curves. Anal Bioanal Chem 401, 2881–2889 (2011). https://doi.org/10.1007/s00216-011-5366-8

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  • DOI: https://doi.org/10.1007/s00216-011-5366-8

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