caa a22 4500 378927353 CHVBK 20180305123621.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.781.54989 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.781.54989 Comparison between in situ and laboratory diffusion studies of HTO and halides in Opalinus Clay from the Mont Terri [Elektronische Daten] [Etienne Tevissen, J. M. Soler, P. Montarnal, A. Gautschi, Luc R. Van Loon] A long-term single-borehole diffusion experiment (DI) using tritiated water (HTO) and stable iodide (127I-) was carried out In the Opalinus Clay of the Mont Terri Underground Rock Laboratory (URL). Diffusion coefficients DL and accessible porosity for HTO, 36Cl- and 125I- were also measured on centimetric Opalinus clay samples using the through diffusion technique. The evolution of tritium and iodide concentration in the injection system over time and in situ profiles were interpreted with a 3-D numerical simulation. A detailed analysis of the results pointed out the effect of a disturbed zone around the borehole with higher diffusion coefficients. The best estimate values for HTO and iodide in the undisturbed rock are DL = 5×10-11m2/s and DL = 1.5×10-11m2/s respectively. For the laboratory tests, DL values for HTO are in the range of 5×10-11m2/s to 8.5×10-11m2/s. For 125I- and 36Cl- the measured values are DL=νmber1.4×10-11 and DL=1.6×10-11m2/s respectively. All HTO results obtained with a through diffusion technique are within the same range as those obtained in the in situ tests. The DL values obtained in diffusion cells with 125I- and 36Cl- and the value drawn from the interpretation of stable 127I- concentration profiles from the in situ tests are very close. In fact, some significant uncertainties could be identified (i.e. a likely chemical retention of iodide on argillites, effect of the disturbed zone). © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Tevissen Etienne aut Soler J. M. aut Montarnal P. aut Gautschi A. aut Van Loon Luc R. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 781-786 0033-8230 92:9-11/2004<781 2004 92 ract https://doi.org/10.1524/ract.92.9.781.54989 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.781.54989 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tevissen Etienne aut NATIONALLICENCE 700 1- Soler J. M. aut NATIONALLICENCE 700 1- Montarnal P. aut NATIONALLICENCE 700 1- Gautschi A. aut NATIONALLICENCE 700 1- Van Loon Luc R. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 781-786 0033-8230 92:9-11/2004<781 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter