Colloidal mobilization from soil and transport of uranium in (sub)-surface waters
| Autor: | Stéphanie Harguindeguy, Fabien Pointurier, Gaëtane Lespes, Pierre Crançon, Martine Potin Gautier |
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| Přispěvatelé: | Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Water Pollutants
Radioactive Materials science Health Toxicology and Mutagenesis Shape index Multiangle light scattering Analytical chemistry chemistry.chemical_element Fresh Water 010501 environmental sciences 01 natural sciences Gyration Atomic mass spectrometry Light scattering Sphericity Diffusion Soil [CHIM.ANAL]Chemical Sciences/Analytical chemistry Environmental Chemistry Colloids Particle Size Groundwater 0105 earth and related environmental sciences Trace element General Medicine Size distribution [CHIM.MATE]Chemical Sciences/Material chemistry Uranium Colloidal characterization Pollution Asymmetric flow field-flow fractionation Fractionation Field Flow 6. Clean water Asymmetric flow field flow fractionation [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry [CHIM.POLY]Chemical Sciences/Polymers chemistry France Particle size |
| Zdroj: | Environmental Science and Pollution Research Environmental Science and Pollution Research, Springer Verlag, 2019, 26 (6), pp.5294-5304. ⟨10.1007/s11356-018-2732-5⟩ |
| ISSN: | 0944-1344 1614-7499 |
| DOI: | 10.1007/s11356-018-2732-5⟩ |
| Popis: | International audience; An analytical methodology was developed to characterize the colloidal distribution of trace elements of interest in environmental waters sampled in a same site and enables the different colloidal distributions from waters to be compared. The purpose was to provide consistent information related to the origin and nature of colloids responsible for the transport of trace element(s). The work was motivated by the observed enhanced mobility of uranium in soil. The colloidal size continuum was investigated by a multi-technique approach involving asymmetric flow field-flow fractionation (AF4) coupled with ultraviolet spectroscopy (UV), multi angle light scattering (MALS), and atomic mass spectrometry (ICPMS). To take into consideration the size and shape variability specific to each sample, the size distributions were established from the gyration radii measured from MALS, also considering the size information from standard nanospheres fractionated by AF4. A new parameter called “shape index” was proposed. It expresses the difference in hydrodynamic behavior between analytes and spherical particles taken as reference. Under AF4 diffusion conditions, it can be considered as an evaluator of the deviation from the sphericity of the fractionated analytes. AF4-UV-MALS-ICPMS enabled the dimensional and chemical characteristics of the colloidal size continuum to be obtained. As a “proof of concept”, the developed methodology was applied at a field scale, in a reference study site. In order to have a “dynamic understanding”, the investigation was based on the joint characterization of colloids from surface waters and soil leachates from static and dynamic processes. In the water samples of the study site, the continuum of gyration radius ranged from a few nanometers up to 200 nm. Colloids containing iron, aluminum, and organic carbon were involved in the uranium transport in the soil column and surface waters. The colloidal uranium concentration in the surface water increased from the upstream location (approximately 13 ng (U) L−1) to the downstream location (approximately 60 ng (U) L−1). |
| Databáze: | OpenAIRE |
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