Evaluation of DGT and DGT-PROFS modeling approach to estimate desorption kinetics of Cs in soils. (September 2021)

• Record Type: Journal Article
• Authors: Ciffroy, P.; Carasco, L.; Orjollet, D.; Simonucci, C.; Février, L.
• Is Part Of: Journal of environmental radioactivity. Volume 235/236(2021)
• Publication Date: 2021-09
• Subjects: DGT -- Cesium -- Kinetics -- DGT-PROFS model; Radioactivity -- Periodicals; Radiation, Background -- Periodicals; Radioecology -- Periodicals; Radioactive pollution -- Periodicals; Environmental Pollutants -- Periodicals; Radioactive Pollutants -- Periodicals; Radioactivity -- Periodicals; Radioécologie -- Périodiques; Pollution radioactive -- Périodiques; Fond de rayonnement -- Périodiques; 539.752
• DOI: 10.1016/j.jenvrad.2021.106646
• Languages: English
• ISSNs: 0265-931X

Abstract

Abstract: The aim of this paper is to assess the suitability of DGT to extract kinetic rates of desorption of cesium (Cs) from soils. For this purpose, laboratory experiments with a natural soil spiked with Cs were carried out under three different contamination conditions, reflecting either an increase in Cs contamination level or an ageing of the contamination within the soil. The experimental results, i.e. the Cs accumulation kinetics onto DGT probes were interpreted by the DGT-PROFS model. The latter calculates the partitioning of Cs between two particulate pools, describing weak and strong interactions respectively, as well as kinetic rates describing exchange reactions. Experimental conditions did not show any major impact on desorption rates, suggesting that desorption kinetics were not significantly affected by contamination level and ageing. Instead, the distribution of Cs among weak and strong sites was shown to be the predominant factor governing the differences observed in the remobilization of Cs to porewater among experimental conditions. The DGT technique combined with the DGT-PROFS modelling approach was proved to be efficient in estimating desorption kinetic rates of Cs in soils. Highlights: Laboratory experiments with a Cs-spiked soil were carried out under three conditions. The accumulation kinetics of Cs onto DGT were interpreted by the DGT-PROFS model. Desorption kinetics are not affected by contamination level and ageing. Contamination level and ageing affect Cs distribution among weak and strong sites.