Smartphone-based colorimetric determination of fluoride anions using polymethacrylate optode

N. V. Saranchina, Y. G. Slizhov, Y. M. Vodova, N. S. Murzakasymova, A. M. Ilyina, N. A. Gavrilenko, M. A. Gavrilenko

Research output: Contribution to journalArticlepeer-review


We developed a new transparent polymer optode based on polymethacrylate with Zr(IV) and alizarin red complex immobilized into it for digital colorimetric and solid-phase spectrophotometric determination of fluoride anions. The matrix changes its colour from purple to yellow after it contacts fluoride anion. We developed a processing algorithm for coloured images which helps calculate mean value for the RGB colour-coordinate system in a selected optode image and translates it into a fluoride concentration value. The analytical signal of the suggested method has a linearity range of 0.1–30 mg⋅L−1 with the detection limit 0.03 mg⋅L−1. Compared to other methods, the modified polymethacrylate matrix is actually a ready-to-use colorimetric system offering rapid results for drinking water quality control.

Original languageEnglish
Article number122103
Publication statusPublished - 1 May 2021


  • Digital colorimetry
  • Fluoride
  • Immobilized reagents
  • Polymethacrylate matrix
  • Solid phase spectrophotometry

ASJC Scopus subject areas

  • Analytical Chemistry

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