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Modelling of solid / liquid fractionation of trace metals for suspended sediments according to the hydro-sedimentary conditions of rivers - Application to 137Cs in the Rhône River (France)
Environmental Modelling & Software ( IF 4.8 ) Pub Date : 2021-09-27 , DOI: 10.1016/j.envsoft.2021.105211
Wirginia Tomczak 1 , Patrick Boyer 1 , Frederique Eyrolle 1 , Olivier Radakovitch 1 , Mohamed Krimissa 2 , Hugo Lepage 1 , Muriel Amielh 3 , Fabien Anselmet 3
Affiliation  

The behavior and impact of trace metals discharged into rivers depend on their solid/liquid fractionation and the fate of these two phases according to hydro-sedimentary processes. The solid/liquid fractionation depends on many environmental factors which imply uncertainties of several orders of magnitude in the evaluation of the partition coefficients, whether by geochemical modelling, in situ measurements or sorption-desorption experiments. In this context, this paper presents a model of solid/liquid fractionation of trace metals with suspended sediments in rivers which integrates the hydro-sedimentary conditions and the properties of the watershed. Its comparison with the 137Cs concentrations measured in the Rhône River (France) thanks to monitoring shows that the solid/liquid fractionation of 137Cs with suspended sediments in rivers depends on chemical processes but also and above all on variations in water flow rate, size and load of suspended sediments and the balance between anthropogenic discharges and the average trace metal content of soils in the watershed.



中文翻译:

根据河流的水文沉积条件对悬浮沉积物中痕量金属的固/液分馏建模 - 应用于罗纳河的 137Cs(法国)

排放到河流中的痕量金属的行为和影响取决于它们的固/液分馏以及这两个阶段根据水沉积过程的命运。固/液分馏取决于许多环境因素,这意味着在评估分配系数时存在几个数量级的不确定性,无论是通过地球化学建模、原位测量还是吸附-解吸实验。在此背景下,本文提出了河流中含有悬浮沉积物的痕量金属的固/液分馏模型,该模型结合了水沉积条件和流域的特性。由于监测,它与在罗纳河(法国)测量的137 Cs 浓度的比较表明,河流中悬浮沉积物的137 Cs 取决于化学过程,但最重要的是取决于水流​​量、悬浮沉积物的大小和负荷的变化,以及人为排放与流域土壤中平均痕量金属含量之间的平衡。

更新日期:2021-10-02
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