bioavailability; karst; dissolved organic matter; colloidal transport; speciation; plutonium; bryophytes; diffusion in thin film (DGT); sf-ICP-MS
Cusnir Ruslan, Christl Marcus, Steinmann Philipp Bochud François, Froidevaux Pascal (2017), Evidence of plutonium bioavailability in pristine freshwaters of a karst system of the Swiss Jura Mountains, in Geochimica et Cosmochimica Acta
, 206, 30-39.
Ruslan Cusnir Maud Jaccard Claude Bailat Marcus Christl Philipp Steinmann Max Haldimann, Francois Bochud and Pascal Froidevaux (2016), Probing the Kinetic Parameters of Plutonium−Naturally Occurring Organic Matter Interactions in Freshwaters Using the Diffusive Gradients in Thin Films Technique, in Environmental Science and Technology
, 50(10), 5103-5110.
Cusnir Ruslan, Steinmann Philipp, Bochud Francois, Froidevaux Pascal (2014), A DGT Technique for Plutonium Bioavailability Measurements, in ENVIRONMENTAL SCIENCE & TECHNOLOGY
, 48(18), 10829-10834.
Cusnir Ruslan, Steinmann Philipp, Christl Marcus, Bochud François, Froidevaux Pascal, Speciation and bioavailability measurements of environmental plutonium using diffusion in thin films, in Journal of Visualized Experiment
We propose a field study of the speciation and bioavailability of plutonium in freshwater using the novel techniques of diffusion in thin film of labile species of metal ions. After a calibration of the method in the laboratory it will be applied in two sites of a karst system in the Swiss Jura Mountains (a spring and a brook).Our goal is a broad understanding of the speciation of plutonium in two chemically different environments (a mineral spring and a organic-rich brook) of the karst of the Jura Mountains. Speciation will be carried out using the determination of labile species by DGT experiments. Colloidal fractions will be determined by ultra-filtration experiments. The focus of the study will be on the plutonium determination by sensitive sf-ICP-MS on the DGT and colloidal fractions of the spring waters. Together, the determination of labile (DGT) and colloidal plutonium will allow constructing a realistic model of plutonium speciation. We are particularly interested in the bioavailable fraction that could be taken up by mosses, which were shown in a previous study to accumulate plutonium in an intra-cellular compartment. As most significant outcomes of this study we expect:• The determination of the diffusion coefficient in APA-gel for plutonium. With this calibration the DGT technique will be available for a wide range of future Pu studies.• The determination of the labile fraction of plutonium in freshwaters, one with a low content of DOM, one with a high content of DOM.• A better understanding of the accumulation of plutonium in the intra-cellular fraction of mosses.• The integration of all measured parameters into a suitable speciation model (e.g. WHAM model, (Tipping, 1994), which will allow to improve the understanding of 239Pu uptake and toxicity in the biosphere. The significance of this study is beyond the freshwaters of the karst of the Jura Mountains, which will serve as a model of many other freshwaters. This work will contribute to our understanding of the mobility of plutonium in the environment and its toxicity for the biota.