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Article Dans Une Revue Analytica Chimica Acta Année : 2021

Dissolved iodide in marine waters determined with Diffusive Gradients in Thin-films technique.

Résumé

For the first time, Diffusive Gradient in Thin-films (DGT) focuses on the inorganic iodine species iodate (IO3-) and iodide (I-). A silver-doped Cl resin (AgdCl), which is known to selectively accumulate I-, was used to make a binding gel. Laboratory investigations were designed to verify the suitability of the AgdCl-DGT method to measure the total I- concentration in environmental waters. Total recovery of I- was obtained using an elution solution containing 100 mmol L-1 KCN. DGT validation experiments in 10 mmol L-1 NaCl showed linear accumulation of I- over time, contrary to IO3-, thus confirming the selectivity of AgdCl-binding gel. The AgdCl-DGT measurement of total I- concentration was independent of pH (4.5 – 8.8) and was not impacted by the presence of bicarbonate (1-5 mmol L-1). Finally, the performance of AgdCl-DGT samplers were tested in two continental waters and a synthetic seawater. The AgdCl-DGT samplers measured 27-33 % of the total I- concentration in the two continental waters up to 24 h of deployment time, whereas the AgdCl-DGT response retrieved the total I- concentration in seawater up to 72 h (106 ± 7 %). The difference in DGT response was attributed to the low ionic strength of the two continental waters, limiting the application of AgdCl-DGT method to media with higher ionic strength.
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hal-03513525 , version 1 (05-01-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Josselin Gorny, Cyrielle Jardin, Olivier Diez, Josep Galceran, Alkiviadis Gourgiotis, et al.. Dissolved iodide in marine waters determined with Diffusive Gradients in Thin-films technique.. Analytica Chimica Acta, 2021, 1177, pp.338790. ⟨10.1016/j.aca.2021.338790⟩. ⟨hal-03513525⟩
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