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Epistemic and aleatory uncertainty in recommended, generic rock K-d values used in performance assessment studies
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
2006 (English)In: Scientific Basis for Nuclear Waste Management XXIX, WARRENDALE, PA: MATERIALS RESEARCH SOCIETY , 2006, Vol. 932, 251-258 p.Conference paper, Published paper (Refereed)
Abstract [en]

Over the past decade or so there has been an explosion in the number of sorption modelling approaches and applications of sorption modelling for understanding and predicting solute transport in natural systems. The most widely used and simplest of all models, however, is that employing a constant distribution coefficient (K-d) relating the sorbed concentration of a solute on a mineral surface and its aqueous concentration. There are a number of reasons why a constant partitioning coefficient is attractive to environmental modellers for predicting radionuclide retardation, and in spite of all the shortcomings and pitfalls associated with such an approach, it remains the leitmotif of most performance assessment transport modelling. This paper examines the scientific basis underpinning the K-d-approach and its broad defensibility in a performance assessment framework. It also examines sources of epistemic and aleatory uncertainty that undermine confidence in K-d-values reported in the open literature. The paper focuses particularly upon the use of so-called "generic" data for generalised rock types that may not necessarily capture the full material property characteristics of site-specific materials. From the examination of recent literature data, it appears that there are still a number of outstanding issues concerning interpretation of experimental laboratory data that need to be considered in greater detail before concluding that the recommended values used in performance assessments are indeed conservative.

Place, publisher, year, edition, pages
WARRENDALE, PA: MATERIALS RESEARCH SOCIETY , 2006. Vol. 932, 251-258 p.
Series
MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS, ISSN 0272-9172 ; 932
Keyword [en]
mineral assemblages, crystalline rocks, yucca mountain, ionic-strength, adsorption, sorption, model, transport, complexes, sorbents
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-41950ISI: 000239003700029Scopus ID: 2-s2.0-33746079622ISBN: 1-55899-889-6 (print)OAI: oai:DiVA.org:kth-41950DiVA: diva2:445790
Conference
29th International Symposium on the Scientific Basis for Nuclear Waste Management. Ghent, BELGIUM. SEP 12-16, 2005
Note
QC 20111005Available from: 2011-10-05 Created: 2011-10-04 Last updated: 2011-10-05Bibliographically approved

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