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- W2205491623 abstract "A new resin- Diphonix(®) in Diffusive Gradients in Thin Films (DGT) technique for the determination of uranium was investigated and compared with previously used binding phases for uranium, Chelex(®)-100 and Metsorb™. The DGT gel preparation and the elution procedure were optimized for the new resin. The U uptake on Diphonix(®) resin gel was 97.4 ± 1.5% (batch method; [U] = 20 μg L(-1); 0.01 M NaNO3; pH = 7.0 ± 0.2). The optimal eluent was found to be 1 M 1-hydroxyethane-1, 1-diphosphonic acid (HEDPA) with an elution efficiency of 80 ± 4.2%. Laboratory DGT study on U accumulation using a DGT samplers with Diphonix(®) resin showed a very good performance across a wide range of pH (3-9) and ionic strength (0.001-0.7 M NaNO3). Diffusion coefficients of uranium at different pH were determined using both, a diffusion cell and the DGT time-series, demonstrating the necessity of the implementation of the effective diffusion coefficients into U-DGT calculations. Diphonix(®) resin gel exhibits greater U capacity than Chelex(®)-100 and Metsorb™ binding phase gels (a Diphonix(®) gel disc is not saturated, even with loading of 10.5 μmol U). Possible interferences with Ca(2+) (up to 1.33 × 10(-2) M), PO4(3-) (up to 1.72 × 10(-4) M), SO4(2-) (up to 4.44 × 10(-3) M) and HCO3(-) (up to 8.20 × 10(-3) M) on U-DGT uptake ([U] = 20 μg L(-1)) were investigated. No effect or minor effect of Ca(2+), PO4(3-), SO4(2-), and HCO3(-) on the quantitative measurement of U by Diphonix(®)-DGT was observed. The results of this study demonstrated the DGT technique with Diphonix(®) resin is a reliable and robust method for the measurement of labile uranium species under laboratory conditions." @default.
- W2205491623 created "2016-06-24" @default.
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- W2205491623 date "2015-08-01" @default.
- W2205491623 modified "2023-09-27" @default.
- W2205491623 title "Evaluation and application of Diffusive Gradients in Thin Films (DGT) technique using Chelex®-100, Metsorb™ and Diphonix® binding phases in uranium mining environments" @default.
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- W2205491623 doi "https://doi.org/10.1016/j.aca.2015.07.057" @default.
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