Evaluation of DGT techniques for measuring inorganic uranium species in natural waters: Interferences, deployment time and speciation

In situ field deployment of DGT devices – manganese dioxide (▪) best suited for sea water monitoring (a) up to 7 days and Metsorb (▪) best suited for fresh water monitoring (b) of inorganic uranium species up to 7 days. [Display omitted] ► The adsorbents Chelex-100, Metsorb and MnO2 were investigate...

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Bibliographic Details
Published in:Analytica chimica acta 2012-08, Vol.739, p.37-46
Main Authors: Turner, Geraldine S.C., Mills, Graham A., Teasdale, Peter R., Burnett, Jonathan L., Amos, Sean, Fones, Gary R.
Format: Article
Language:English
Subjects:
Adsorbents
Analytical chemistry
Applied sciences
Binding
Chelating Agents - chemistry
Chelex-100
Chemistry
Diffusion
Diffusion layers
Diffusive gradients in thin films
Environmental Monitoring - methods
Exact sciences and technology
Fresh Water - chemistry
Global environmental pollution
Manganese Compounds - chemistry
Manganese dioxide
Membranes, Artificial
Metsorb
Nanostructure
Natural waters
Oxides - chemistry
Pollution
Resins, Synthetic - chemistry
Sea water
Seawater - chemistry
Time Factors
Titanium - chemistry
Titanium dioxide
Uptakes
Uranium
Uranium - analysis
Water Pollutants, Chemical - analysis
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Summary:In situ field deployment of DGT devices – manganese dioxide (▪) best suited for sea water monitoring (a) up to 7 days and Metsorb (▪) best suited for fresh water monitoring (b) of inorganic uranium species up to 7 days. [Display omitted] ► The adsorbents Chelex-100, Metsorb and MnO2 were investigated for use with DGT. ► All three adsorbents performed well in low ionic strength solutions. ► MnO2 resin was found to be the most suitable for marine deployments. ► DGT is able to measure isotopic ratios of U down to concentrations of 0.1μgL−1. ► DGT underestimated U concentrations by at least 50% if the DBL was not taken into account. Three adsorbents (Chelex-100, manganese dioxide [MnO2] and Metsorb), used as binding layers with the diffusive gradient in thin film (DGT) technique, were evaluated for the measurement of inorganic uranium species in synthetic and natural waters. Uranium (U) was found to be quantitatively accumulated in solution (10–100μgL−1) by all three adsorbents (uptake efficiencies of 80–99%) with elution efficiencies of 80% (Chelex-100), 84% (MnO2) and 83% (Metsorb). Consistent uptake occurred over pH (5–9), with only MnO2 affected by pH
ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2012.06.011