Sorption of Se(-II) on illite, MX-80 bentonite, shale, and limestone in Na – Ca – Cl solutions
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Selenium has been identified as an element of interest for the safety assessment of a deep geologicalrepository (DGR) for used nuclear fuel. In Canada, groundwaters at DGR depths in sedimentary rockshave been observed to have a high ionic strength. This paper examines the sorption behavior of Se(-II)onto illite, MX-80 bentonite, Queenston shale, and argillaceous limestone in NaeCaeCl solutions ofvarying ionic strength (0.1e6 mol/kgw (m)) and across a pH range of 4e9. Little ionic strength dependence for Se(-II) sorption onto all solids was observed except that sorption at high ionic strength (6 m)was generally slightly lower than sorption at low ionic strength (0.1 m). Illite and MX-80 exhibited theexpected results for anion sorption, while shale and limestone exhibited more constant sorption acrossthe pH range tested. A non-electrostatic surface complexation model successfully predicted sorption ofSe(-II) onto illite and MX-80 using the formation of an inner-sphere surface complex and an outer-spheresurface complex. Optimized values for the formation reactions of these surface species were proposed
Abstract
Selenium has been identified as an element of interest for the safety assessment of a deep geologicalrepository (DGR) for used nuclear fuel. In Canada, groundwaters at DGR depths in sedimentary rockshave been observed to have a high ionic strength. This paper examines the sorption behavior of Se(-II)onto illite, MX-80 bentonite, Queenston shale, and argillaceous limestone in NaeCaeCl solutions ofvarying ionic strength (0.1e6 mol/kgw (m)) and across a pH range of 4e9. Little ionic strength dependence for Se(-II) sorption onto all solids was observed except that sorption at high ionic strength (6 m)was generally slightly lower than sorption at low ionic strength (0.1 m). Illite and MX-80 exhibited theexpected results for anion sorption, while shale and limestone exhibited more constant sorption acrossthe pH range tested. A non-electrostatic surface complexation model successfully predicted sorption ofSe(-II) onto illite and MX-80 using the formation of an inner-sphere surface complex and an outer-spheresurface complex. Optimized values for the formation reactions of these surface species were proposed
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