Chip-based spectrofluorimetric determination of iodine in a multi-syringe flow platform with and without in-line digestion — application to salt, pharmaceuticals, and algae samples

Joana L. A. Miranda, Raquel B. R. Mesquita, Edwin Palacio, José M. Estela, Víctor Cerdà, António O. S. S. Rangel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
16 Downloads

Abstract

In this work, a flow-based spectrofluorimetric method for iodine determination was developed. The system consisted of a miniaturized chip-based flow manifold for solutions handling and with integrated spectrofluorimetric detection. A multi-syringe module was used as a liquid driver. Iodide was quantified from its catalytic effect on the redox reaction between Ce(IV) and As(III), based on the Sandell–Kolthoff reaction. The method was applied for the determination of iodine in salt, pharmaceuticals, supplement pills, and seaweed samples without off-line pre-treatment. An in-line oxidation process, aided by UV radiation, was implemented to analyse some samples (supplement pills and seaweed samples) to eliminate interferences and release iodine from organo-iodine compounds. This feature, combined with the fluorometric reaction, makes this method simpler, faster, and more sensitive than the classic approach of the Sandell–Kolthoff reaction. The method allowed iodine to be determined within a range of 0.20–4.0 µmol L−1, with or without the in-line UV digestion, with a limit of detection of 0.028 µmol L−1 and 0.025 µmol L−1, respectively.
Original languageEnglish
Article number1325
Pages (from-to)1-17
Number of pages17
JournalMolecules
Volume27
Issue number4
DOIs
Publication statusPublished - 16 Feb 2022

Keywords

  • Chip-based manifold
  • In-line UV digestion
  • Iodine
  • Multi-syringe flow system
  • Photooxidation
  • Sandell–Kolthoff reaction
  • Spectrofluorimetry

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