ArticleScientific reports2026
Fluorescein spectrofluorometric quenching detection of chloride and iodide using eight-Blue-LEDs excitation and dual solar cells.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study presents a novel, custom‑built fluorescence detector for the precise determination of chloride and iodide ions based on their quenching effect on fluorescein. The detection system incorporates eight blue LEDs irradiation sources arranged at 0-90° angles relative to twin solar cell detectors connected. Two fluorescence quenching strategies were developed. The injected‑mixture mode (IMFQ) exhibited linear ranges of 0.00-1.00 mM for Cl⁻ and 0.00-1.25 mM for I⁻, with detection limits of 20 µM and 10 µmol L⁻¹, respectively. The continuous‑flow mode (CFFQ) demonstrated superior sensitivity with a dispersion factor of 1.33, wider linear ranges (0.1-6.0 mM for Cl⁻ and 0.05-6.0 mM for I⁻), and lower detection limits (10 µM and 5 µM, respectively). Both strategies rely on Stern‑Volmer kinetics and were successfully applied to real samples (table salts and detergents) with excellent recoveries (95.7-108.1%).
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