On the use of a multi-site ion-exchange model to predictively simulate the adsorption behaviour of strontium and caesium onto French agricultural soils

Siroux, Brice; Latrille, Christelle; Beaucaire, Catherine; Petcut, Cristina; Tabarant, Michel; Benedetti, Marc F.; Reiller, Pascal E.

doi:10.1016/j.apgeochem.2021.105052

Cited by 10 publications

(1 citation statement)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Subsequently to the nuclear contamination in the Fukushima prefecture, numerous studies have been dedicated to the understanding of radiocesium mobility to predict their impact in the environment and so to anticipate potential risks on health (Klika et al 2007; Nakao et al 2014;Liu et al 2004; Kasar et al 2020; Siroux et al 2021). To counteract the bioavailability of cesium in soils, K fertilization was recommended in Japan (Kato et al 2015) to deplete Cs incorporation by plants by acting on competing rule between Cs and K in plants as well as in soils (Kato et al 2015; Kubo et al 2015Kubo et al , 2017.…”

Section: Introductionmentioning

confidence: 99%

Multi-cation exchanges involved in cesium and potassium sorption mechanisms on vermiculite and micaceous structures

Dubus

Leonhardt

Latrille

2022

Environ Sci Pollut Res

Self Cite

View full text Add to dashboard Cite

Vermiculite and micaceous minerals are relevant Cs sorbent in soils and sediments. To understand Cs bioavailability in soils resulting from multi-cation exchanges, Cs sorption onto clay minerals have been carried out in batch experiments with solutions containing Ca 2+ , Mg 2+ and K + . A sequence between a vermiculite and various micaceous structures were achieved by conditioning a vermiculite at various amounts of K. Competing cation exchanges were investigated according to the concentration of Cs. The contribution of K on trace Cs desorption is probed by applying different concentrations of K on Cs-doped vermiculite and micaceous structures. Cs sorption isotherms at chemical equilibrium were combined with elemental mass balances in solution and structural analyses. Cs replace easily Mg 2+ > Ca 2+ and competes scarcely with K. Cs is strongly adsorbed on the various matrix and a K/Cs ratio about a thousand is required to remobilize Cs. Cs is exchangeable as long as the clay interlayer space remains open to Ca 2+ . However, excess of K, as well as Cs, in solution leads to the collapse of the interlayer spaces that locks the Cs into the structure. Once K and/or Cs collapse the interlayer space, the external sorption sites are then particularly involved in Cs sorption. Subsequently, Cs + exchanges preferentially with Ca 2+ rather than Mg 2+ . Mg 2+ is extruded from the interlayer space by Cs + and K + adsorption, excluded from short interlayer space and replaced by Ca 2+ as Cs + desorbs.

show abstract