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Nickel Retention on Callovo-Oxfordian Clay: Applicability of Existing Adsorption Models for Dilute systems to Real Compact Rock.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-14 , DOI: 10.1021/acs.est.0c04381
Gilles Montavon 1 , Catherine Lerouge 2 , Karine David 1 , Solange Ribet 1 , Yahaya Hassan-Loni 1 , Myriam Leferrec 1 , Céline Bailly 1 , Jean-Charles Robinet 3 , Bernd Grambow 1
Affiliation  

In a waste management context, predicting the mobility of contaminants is essential. A key issue entails assessing the applicability of current knowledge on adsorption processes to natural systems. Such is the focus herein for nickel in interaction with Callovo-Oxfordian (COx) clay rock, a formation selected in France for possible radioactive waste disposal. The challenge is to link predictive modeling results with the experimental data characterizing the behavior of the labile and naturally occurring Ni fraction by implementing a new simple method. Retention studies on compact systems serve to complete this work. Combined electron microprobe and laser ablation high-resolution inductively coupled plasma mass spectrometry data show that natural Ni (∼39 mg kg–1) is homogeneously distributed within the clay matrix, which corresponds to the main reservoir (∼70%). Data interpretation of desorption tests yields an in situ Kd value of ∼80 L kg–1 and a labile Ni amount of ∼5 mg kg–1, that is, ∼13% of the Ni inventory. Predictive modeling explains the sorption data in considering that only weak clay fraction sites take part in the adsorption. The role of the clay matrix in Ni retention is confirmed by analyzing the Ni-spiked compact COx samples, whereby an increase of the Ni content in the clay fraction is observed following the retention experiment.

中文翻译:

镍在Callovo-Oxfordian黏土上的保留:现有的稀薄系统吸附模型对实际致密岩石的适用性。

在废物管理的背景下,预测污染物的迁移率至关重要。一个关键问题是评估现有知识对自然系统吸附过程的适用性。这就是镍与Callovo-Oxfordian(COx)黏土岩石相互作用的重点,这是在法国选择用于可能的放射性废物处置的地层。面临的挑战是通过实施一种新的简单方法,将预测建模结果与表征不稳定和自然存在的Ni组分行为的实验数据联系起来。对紧凑型系统的保留研究有助于完成这项工作。电子探针与激光烧蚀相结合的高分辨率电感耦合等离子体质谱数据表明,天然镍(〜39 mg kg –1)均匀分布在粘土基质中,对应于主要储层(〜70%)。解吸测试的数据解释得出的原位K d值为〜80 L kg –1,不稳定的Ni量为〜5 mg kg –1,即Ni存量的〜13 %。考虑到只有弱黏土部分位点参与吸附,所以预测模型解释了吸附数据。通过分析掺有镍的紧凑型COx样品,可以确认粘土基质在Ni保留中的作用,从而在保留实验后观察到粘土级分中Ni含量的增加。
更新日期:2020-10-06
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