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Poster De Conférence Année : 2019

Better understanding and applications of ammonium 12-molybdophosphate-based diffusive gradient in thin film techniques for measuring Cs in waters

Résumé

Chang (1998) and Murdock et al. (2001) performed numerous laboratory and field experiments to define the application scope of the AMP-DGT method. Briefly, the response of AMP-DGT was pH independent in synthetic freshwater (pH 2 – 10) and in sea waters (pH 4.5 – 10) for 8 h of deployment time. During this deployment time, no influence of Na+ (50 µmol L-1 – 0.5 mol L-1) and Ca2+ concentrations (5 µmol L-1 – 10 mmol L-1) were observed at pH 5.5 on Cs uptake by DGT from water. Correct DGT performances were obtained up to 1 month deployment time during field application in the Llyn Trawsfydd Lake (pH 6.1 – 8), before being progressively decreased to 81 % of the expected value after 5 months deployment time. The changes in DGT performances over time were possibly linked to the growth of algae / bacteria biofilm, the temperature impact on diffusion coefficient and the chemical degradation of AMP shown by a gradual loss of its characteristic yellow color. Concerning the last point, factors causing AMP binding gel degradation in DGT unit were not discussed, and their consequences on the accumulation of Cs by AMP-DGT samplers were not clearly identified. This study is dealing with an evaluation of AMP-DGT method under unfavourable conditions to maintain stable AMP binding gel in DGT unit, such as moderately basic environmental water (pH 7 – 9). Laboratory experiments were designed: (i) to identify factors controlling AMP binding gel degradation during storage and DGT deployment and (ii) to assess the possible impact of AMP degradation over time on the DGT response in waters with various chemical composition. Conclusions on potential limitations of AMP-DGT methods will finally be discussed for a better use of this technique for field applications.
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hal-02460187 , version 1 (29-01-2020)

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  • HAL Id : hal-02460187 , version 1

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Josselin Gorny, Alkiviadis Gourgiotis, Frederic Coppin, Laureline Fevrier, Hao Zhang, et al.. Better understanding and applications of ammonium 12-molybdophosphate-based diffusive gradient in thin film techniques for measuring Cs in waters. Diffusive gradients in thin films Conference 2019, Diffusive gradients in thin films Conference 2019, Sep 2019, VIENNE, Austria. 2019. ⟨hal-02460187⟩
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