Novel speciation method based on Diffusive Gradients in Thin Films for in situ measurement of uranium in the vicinity of the former uranium mining sites

Simultaneous determination of arsenic and uranium by the diffusive gradients in thin films technique using Lewatit FO 36: Optimization of elution protocol

“…Given that the saturation of resin gel was not achieved, the total uptake capacity of Lewatit FO 36 towards uranium has not been established. In comparison with other binding phases used for the determination of U, the uptake capacity of Lewatit FO 36 is comparable or much higher than the capacities reported by Drozdzak et al [12,20]. In these studies, the maximum uptake capacities of PIWBA, Chelex-100, and Metsorb resins were determined as 13 99.9-249.9 μg of U per gel disc.…”

Transport and speciation of uranium in groundwater-surface water systems impacted by legacy milling operations

“…Bicarbonate concentrations were elevated in the Riverton sediment pore waters at 15 cm depth (423 to 755 mg L -1 ) and surface water (179 mg L -1 ) (Naftz et al, 2019). Drozdzak et al (2016) reported decreased U uptake on the DGT PIWBA resin in the presence of high Ca and SO4 concentrations. Although these previous studies were not conducted under the same field conditions as the Little Wind River, they do provide evidence that major ion concentrations (Ca, SO4, HCO3) in the sediment pore water and surface water were at high enough concentrations to slow U accumulation in the DGT probes due to competition effects.…”

“…Diffusive gradients in thin-film (DGT) samplers, in conjunction with speciation modelling, are then used to investigate the potential bioavailability of U in ground and surface waters. Both DET and DGT samplers have previously been used to establish U concentrations and speciation in surface waters (Drozdzak et al, 2016;Hutchins et al, 2012;Turner et al, 2014;Turner et al, 2012) and in sediments in laboratory microcosm experiments (Gregusova and Docekal, 2013). However, our study is the first to apply DET and DGT techniques in-situ to investigate U concentrations, transport and speciation in a groundwater-surface water system.…”

Diffusive Gradients in Thin-films technique for uranium monitoring along a salinity gradient: A comparative study on the performance of Chelex-100, Dow-PIWBA, Diphonix, and Lewatit FO 36 resin gels in the Scheldt estuary

“…This is especially apparent when DGTs are deployed in complex matrices such as seawater or when deployed for longer periods [41,42]. Therefore, Chelex-100 has been replaced by other binding phases (i.e., Diphonix [17,43], Dowex 2×8-6 400 [44], MnO2 [41], Metsorb [42], Dow-PIWBA [45], Spheron-Oxin [46], or Lewatit FO 36 [47]) more suitable for the selective determination of uranium. Their binding mechanisms are either based on chelation (Diphonix and Spheron-Oxin), sorption (Metsorb and MnO2), anion exchange (Dowex 2×8-400), or both sorption and anion exchange (Dow-PIWBA and Lewatit FO 36).…”