斜长石
吸附
黑云母
石英
铯
化学
长石
矿物
矿物学
钾
分配系数
粘土矿物
地质学
吸附
分析化学(期刊)
无机化学
环境化学
色谱法
古生物学
有机化学
作者
Eveliina Muuri,Jussi Ikonen,Minja Matara-aho,Antero Lindberg,Stellan Holgersson,Mikko Voutilainen,Siitari-Kauppi Marja,Andrew J. Martin
出处
期刊:Radiochimica Acta
[Oldenbourg Wissenschaftsverlag]
日期:2016-04-07
卷期号:104 (8): 575-582
被引量:24
标识
DOI:10.1515/ract-2015-2574
摘要
Abstract In this study the sorption of cesium was investigated on four different minerals; quartz, plagioclase, potassium feldspar and biotite as well as granodiorite obtained from the Grimsel test site in Switzerland. The experiments were conducted in the presence of the weakly saline Grimsel groundwater simulant by determining the distribution coefficients using batch sorption experiments and PHREEQC-modelling across a large concentration range. In addition, the purity of the minerals was measured byXRDand the specific surface areas by BET method using krypton. The distribution coefficients of cesiumwere largest on biotite (0.304±0.005 m 3 /kg in 10 -8 M). Furthermore, the sorption of cesiumon quartzwas found to be negligibly small in all investigated concentrations and the sorption of cesium on potassium feldspar and plagioclase showed similar behavior against a concentration isotherm with distribution coefficients of 0.0368±0.0004 m 3 /kg and 0.18±0.04 m 3 /kg in 10 -8 M. Finally, cesium sorption behavior on crushed granodiorite followed the trend of one of its most abundant mineral, plagioclase with distribution coefficient values of 0.107±0.003 m 3 /kg in 10 -8 M. At low concentrations (<1.0·10 -6 M) cesiumwas sorbed on the frayed edge sites of biotite and once these sites are fully occupied cesium sorbs additionally to the Type II and Planar sites. As a consequence, the sorption of cesium on biotite is decreased at concentrations >1.0·10 -6 M. Secondly cesium sorption on potassium feldspar and plagioclase showed similar non-linear behavior with varying concentration. The results were used to assist the interpretation of cesium diffusion process in the 2.5 year in-situ experiment carried out in the underground laboratory at Grimsel test site in Switzerland (2007–2009).
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