Porewater Chemistry in Claystones in the Context of Radioactive Waste Disposal

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• 作者：P. Wersin^a ; ^{paul.wersin@geo.unibe.ch} ; D. Traber^b ; U.K. Mä ; der^a ; M. Mazurek^a ; H.N. Waber^a ; D. Rufer^a ; T. Gimmi^a ; ^c ; V. Cloet^b
• 关键词：porewater chemistry ; claystones ; overview ; methodology ; uncertainties
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：718-721
• 全文大小：136 K
• 卷排序：17

文摘

The development of a combined experimental-modelling approach has enabled to constrain the porewater chemistry of different low-permeability clay formations (Boom Clay, Callovo-Oxfordian Fm., Opalinus Clay) foreseen as host rocks for nuclear waste repositories. A variety of methods are available to directly sample porewater or to derive information on the solute concentrations. These include analysis from seepage waters in boreholes, aqueous extractions, high-pressure squeezing, and advective displacement from core samples. Geochemical equilibrium modelling is used for data integration and calculation of internally consistent reference water compositions. The paper provides an overview of current achievements in experimental developments, modelling approaches and open questions.