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(1) The Da values for HSe obtained under reducing conditions are about 1 order of magnitude smaller than those for SeO32  obtained under anaerobic conditions, and it was found that Se was strongly retarded under reducing conditions.
(2)The Da values increased with increasing silica sand content and temperature.
(3) The Da values were well correlated with smectite partial density, which indicates that Se diffusion including the retardation processes is predominantly controlled by the properties of smectite.
(4) The DEa(porewater) values for Da of HSe were in the range of 17.6¨C31.6 kJ/mol and were slightly higher than DEa(free water) for Do of HS, which takes the same species as HSe in solution. A reason might be that the nature of the porewater in compacted bentonite is different from that of free water.

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