Speciation measurements of uranium in alkaline waters using diffusive gradients in thin films technique

Method of diffusive gradients in thin films (DGT) compared with other soil testing methods to predict phytoavailability of uranium and selected heavy metals from multipolluted soils

“…Only if neutral and negative charged complexes dissociate upon contact with the soil-DGT interface, uranyl can be sorbed by the resin. The higher C DGT /C sol ratio (0.57) for the alkaline soil (with a predominance of negatively charged uranylcarbonate species), compared to that of the acid soil (0.22) (with a predominance of the free uranyl cation), implies a fast dissociation of negatively charged complexes, as found by Li et al [12]. C DGT was not significantly related to the concentration of free uranyl or positively charged U species (Table 2).…”

“…For f e we applied a value of 0.678 for U as proposed by Li et al [12] and a value of 0.8 as proposed by Zhang and Davison [6]. Time-averaged concentration at the soil interface diffusive layer was calculated from: (Table 1).…”

Assessing Bioavailability of Hydrophobic Organic Compounds and Metals in Sediments Using Freely Available Porewater Concentrations

“…The technique has been used to detect various trace levels of ionic species by employing different types of resins and diffusive layers Dočekalov and Diviš, 2005;Clarisse and Hintelmann, 2005;Li et al, 2006Li et al, , 2009. DGT probes have been applied to a variety of soil and sediment to measure porewater metal concentrations and to study remobilization kinetics of metals (Nowack et al, 2004;Ernstberger et al, 2005).…”

Passive Sampling Technologies

“…Currently, only Cs, Sr, Tc and U have been studied, with Cs, Sr and U concentrations assessed using the DGT in fresh waters (Chang et al ., 1998;Murdock et al ., 2001;Li et al ., 2006Li et al ., , 2007 and 99 Tc in seawater (French et al ., 2005). 99 Tc in seawater was measured using DGT with TEVA (Eichrom Technologies) resin as the binding agent.…”

“…These detection limits are sufficiently low for monitoring contaminated environments, including the Irish Sea. Uranium measurements have currently focused on using DGT for speciation measurements in freshwaters using different binding resins (Li et al ., 2006(Li et al ., , 2007. There is, however, potential for the development of passive samplers to measure actinide concentrations in coastal waters in both clean and contaminated environments.…”