Experimental data for: Retention of 226Ra in the sandy Opalinus Clay facies from the Mont Terri rock laboratory, Switzerlanddoi:10.26165/JUELICH-DATA/IFD1I9Jülich DATA2023-10-101Ait Mouheb, Naila; Yang, Yuankai; Deissmann, Guido; Klinkenberg, Martina; Poonoosamy, Jenna; Vinograd, Victor; Van Loon, Luc R.; Bosbach, Dirk, 2023, "Experimental data for: Retention of 226Ra in the sandy Opalinus Clay facies from the Mont Terri rock laboratory, Switzerland", https://doi.org/10.26165/JUELICH-DATA/IFD1I9, Jülich DATA, V1Experimental data for: Retention of 226Ra in the sandy Opalinus Clay facies from the Mont Terri rock laboratory, Switzerlanddoi:10.26165/JUELICH-DATA/IFD1I9Ait Mouheb, NailaYang, YuankaiDeissmann, GuidoKlinkenberg, MartinaPoonoosamy, JennaVinograd, VictorVan Loon, Luc R.Bosbach, Dirk02NUK053ASO-093Jülich DATAAit Mouheb, NailaAit Mouheb, Naila2023-09-18Earth and Environmental SciencesIn this study, we report results of the impact of the natural heterogeneity of sandy facies of the Opalinus clay (OPA-SF) on 226Ra uptake in drill core (BAD 1) samples from the Mont Terri underground rock laboratory. The samples were carefully characterized with respect to mineralogy and chemistry using, e.g., XRD and SEM/EDS. The uptake behaviour of 226Ra is evaluated using batch sorption experiments. This dataset contains experimental data on a) 226Ra sorption kinetics and 226Ra sorption on sandy Opalinus Clay as a function of the S/L ratio, b) the characterization of the mineralogical composition of rock samples and the different pore-waters in equilibrium with each clay sample, c) a representation of the mineralogical composition of rock samples in a ternary diagram QFM (quartz, feldspar, and mica), and d) calculated speciation of 226Ra and saturation indices (SI) for Ra-phases in synthetic Opalinus Clay pore water and predicted mole fractions of BaSO4 and SrSO4 in (Sr,Ba)SO4 celestine solid solutions.Calculated speciation of 226Ra.xlsxTable A2. Calculated speciation of 226Ra (CRa = 2·10-8 mol L-1) and saturation indices (SI) for Ra-phases in synthetic Opalinus Clay pore water after Pearson (1998).application/vnd.openxmlformats-officedocument.spreadsheetml.sheetExperimental data of 226Ra sorption kinetics.xlsxTable A5. Experimental data of 226Ra sorption kinetics on sandy Opalinus Clay at pH 7.6 and I = 0.39 mol·L-1 (cf. Fig. 9). application/vnd.openxmlformats-officedocument.spreadsheetml.sheetExperimental data of 226Ra sorption on sandy Opalinus Clay as a function of the S-L ratio Table A6 . Experimental data of 226Ra sorption on sandy Opalinus Clay as a function of the S/L ratio at pH 7.6 and I = 0.39 mol·L-1 (cf. Fig. 12).application/vnd.openxmlformats-officedocument.spreadsheetml.sheetMineralogical composition (in wt.%) of rock samples.xlsxTable A3. Mineralogical composition (in wt.%) of rock samples from the lower sandy facies of the Opalinus Clay at Mont Terri taken from drill cores BDB-1 (Lerouge et al., 2015; Waber and Rufer, 2017) and BWS-H (Houben et al., 2014).application/vnd.openxmlformats-officedocument.spreadsheetml.sheetPore water composition.xlsxTable A1. Chemical composition (mol·L-1) of the different pore-waters in equilibrium with each clay sample and used in the sorption experiments in comparison to the synthetic Opalinus Clay pore water after Pearson (1998).application/vnd.openxmlformats-officedocument.spreadsheetml.sheetPredicted mole fractions of BaSO4 and SrSO4.docxFigure A2. Predicted mole fractions of BaSO4 and SrSO4 in (Sr,Ba)SO4 celestite solid solution, whose fraction in the system is fixed at 0.4 wt. % of the total solid.application/vnd.openxmlformats-officedocument.wordprocessingml.documentRepresentation of the mineralogical composition of rock samples.docxFigure A1. (Left) Representation of the mineralogical composition of rock samples from the lower sandy Opalinus Clay facies from drill core BAD-1 in a ternary diagram QFM (quartz, feldspar, and mica) – clay minerals – carbonates; (Right) lithotype classification of organic mudstones based on their mineralogical composition after Gamero-Diaz et al. (2013) and Glaser et al. (2014).application/vnd.openxmlformats-officedocument.wordprocessingml.documentResult of EDS spot analyses of (Ba, Sr)-sulphate.xlsxTable A4. Result of EDS spot analyses of (Ba, Sr)-sulphate from the lower sandy Opalinus Clay facies (cf. Fig. 8). application/vnd.openxmlformats-officedocument.spreadsheetml.sheet