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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
Published on: November 9, 2015
Diffusive gradients in thin films technique for uranium measurements in river water
Weijia Li1, Chunsheng Li, Jiujiang Zhao
1Radiation Protection Bureau, Health Canada, A.L.:6302D1, 775 Brookfield Rd, Ottawa, ON, K1A 1C1, Canada. weijia li@hc-sc.gc.ca
Analytica Chimica Acta
|May 15, 2007
Summary
The diffusive gradients in thin films (DGT) technique effectively measured uranium in water using different binding phases. Dow DGT showed the lowest uranium measurement, while DE DGT showed the highest, providing insights into uranium speciation.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Geochemistry
Background:
- Uranium contamination in water poses environmental and health risks.
- Accurate measurement of uranium speciation is crucial for understanding its behavior and fate in aquatic systems.
- The diffusive gradients in thin films (DGT) technique offers a promising approach for in-situ speciation analysis.
Purpose of the Study:
- To evaluate the performance of diffusive gradients in thin films (DGT) devices with different binding phases for uranium measurement in natural waters.
- To compare the effectiveness of Dowex resin (Dow DGT), Chelex 100 resin (Chelex DGT), and DE 81 anion exchange membrane (DE DGT) in capturing uranium.
- To investigate the influence of different binding phases on uranium speciation analysis using DGT.
Main Methods:
- Deployment of DGT devices with Dowex resin, Chelex 100 resin, and DE 81 anion exchange membrane in synthetic and natural river water.
- Comparison of uranium measurements obtained from different DGT devices against total uranium concentration.
- Analysis of DGT working mechanisms, including complex equilibrium, binding phase reduction, and dissociation within the diffusive layer.
Main Results:
- Dow DGT in synthetic river water showed 84% response to total uranium.
- In natural river water, Dow DGT measured the lowest uranium (45% of total), while DE DGT measured the highest (98% of total).
- Observed differences in measurements were attributed to variations in binding phase affinity, complex equilibrium, and dissociation dynamics.
Conclusions:
- Different binding phases in DGT devices exhibit varying efficiencies for uranium measurement and speciation in natural waters.
- DE DGT appears most effective for quantifying total uranium, while Dow DGT provides lower measurements potentially reflecting specific uranium species.
- Further deployment of DGT devices with diverse binding phases can yield valuable information on uranium speciation in complex aquatic environments.
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