Salinity effect on bisulfide diffusive transport through compacted MX-80 bentonite

Understanding solute transport behaviour in bentonite barriers is critical for evaluating the long-term safety of deep geological repositories. This study investigated the effect of salt (NaCl) concentrations on the diffusive transport of bisulfide (HS − ) and bromide (Br − , a conservative analogue), through MX-80 bentonite at a dry density of 1090 kg m −3 by performing through-diffusion experiments. Our previous study showed that at low NaCl ionic concentration (<0.05 M), the effective diffusi