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- W2086069123 abstract "A simple fluorescent detection based on the ligand exchange mechanism is proposed for the fluoride ion in aqueous media. This procedure is based on the exchange of 8-hydroxyquinoline (oxine) coordinated to Zr(IV) by fluoride ion without interference from other common anions. The ternary complex of oxine with [Zr(H2O)2EDTA]·2H2O formed by replacing two water molecules in aqueous solution provides a sensitive signalling system for fluoride ion in the concentration range from 6 × 10−7 M to 8 × 10−4 M. The green fluorescence (λmax = 532 nm) exhibited by the complex upon excitation at 247 nm decreases in intensity with fluoride addition with a detection limit of 12 ppb. The complexation reaction between oxine and Zr(IV)–EDTA and the ligand exchange reaction with fluoride ion has been investigated by UV–vis and fluorescence spectroscopies combined with the PM3 semi-empirical quantum chemical calculations. Job's method of continuous variation and the molar ratio method ascertain a 1:1 stoichiometry composition of the chelate in aqueous media." @default.
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- W2086069123 date "2006-11-01" @default.
- W2086069123 modified "2023-09-27" @default.
- W2086069123 title "Fluoride ion detection by 8-hydroxyquinoline–Zr(IV)–EDTA complex" @default.
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- W2086069123 doi "https://doi.org/10.1016/j.saa.2005.12.011" @default.
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