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After the saturation of the bentonite, a small volume of Na275 SeO3 (50 Al, about 22 kBq) was pipetted onto the surface of one end of each cylindrical bentonite sample and a blind lid was then sealed shut. The other end of the bentonite remained in contact with degassed distilled water with Na2S2O4 via ceramic filter. The Eh and pH of the solution contacting the bentonite were monitored throughout the saturation and diffusion experiments. Although the reductant was added to initially obtain a concentration of [Na2S2O4]=5.210 3M, it was then added to adjust the Eh of the solution if necessary. In this case, the final concentrations of Na2S2O4 were8.210 3M at 22.5 jC and 1.210 2Mat60 jC, respectively. The diffusion experiments were run for 1¨C14 days.

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