irsn-04064986
https://irsn.hal.science/irsn-04064986
https://irsn.hal.science/irsn-04064986/document
https://irsn.hal.science/irsn-04064986/file/Coppin%20et%20al_post_print.pdf
doi:10.1021/acsearthspacechem.2c00324
[SDE] Sciences De l'Environnement
[IRSN] Institut de radioprotection et de sûreté nucléaire - IRSN
[GIP-BE] GIP Bretagne Environnement
[PSEENV] Pôle Santé Environnement- Direction Environnement - PSE-ENV
[SRTE] Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes - IRSN/PSE-ENV/SRTE
Operational Method to Easily Determine the Available Fraction of a Contaminant in Soil and the Associated Soil-Solution Distribution Coefficient
Coppin, Frédéric
Février, Laureline
Martin-Garin, Arnaud
[SDE] Environmental Sciences
ART
contaminant environmentally available fraction
successive batch extractions
soil
predictive modeling
radionuclide
trace element
pollutant
Well understanding the solid/solution partitioning of a contaminant is of first importance to determine its residence time in the environment, environmental availability, or bioavailability. Currently, parameters of contaminant transfer models are derived from two conceptually different approaches: one considering that the totality of the contaminant is in equilibrium between the solid and the solution and the other one considering that only a part of the contaminant can be transferred from the solid to the solution without considering equilibrium. Our work offers to reconcile these two approaches by assuming that the contaminant associated with the solid is present under two fractions: one available at equilibrium with the solution, and a second one not available and nontransferable to the solution. We propose to use simple operational batch methods (successive desorption batch experiments, or batch desorption conducted at different volume of solution/mass of solid (V/M) ratios) to check this assumption and to determine the real available contaminant fraction (i.e., the contaminant in the solid which can be at equilibrium with the solution) and its associated solid/solution distribution coefficient. The robustness of the proposed method was tested on simulated conditions, on experiments performed to validate the approach, and on the reinterpretation of literature data. Finally, the use of the available contaminant fraction and its associated solid/solution distribution coefficient in transfer models can improve the predictive modeling of contaminant transfer in the soil/solution/plant system.
2023-03-16
2023-07-14
en
ACS Earth and Space Chemistry
ACS