Effect of Phosphate on the Diffusion of Se(Ⅳ) in GMZ Bentonite

WU Tao; LI Qing-mei; WANG Hai; LIU Si; FENG Wen-xiao; LI Jin-ying

doi:10.7538/hhx.2015.37.04.0238

Journal of Nuclear and Radiochemistry > 2015 > 37(4): 238-242. > DOI: 10.7538/hhx.2015.37.04.0238

WU Tao, LI Qing-mei, WANG Hai, LIU Si, FENG Wen-xiao, LI Jin-ying. Effect of Phosphate on the Diffusion of Se(Ⅳ) in GMZ Bentonite[J]. Journal of Nuclear and Radiochemistry, 2015, 37(4): 238-242. DOI: 10.7538/hhx.2015.37.04.0238

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Effect of Phosphate on the Diffusion of Se(Ⅳ) in GMZ Bentonite

1.
School of Life Science, Huzhou University, Huzhou 313000, China
2.
Department of Environment Engineering, East China Institute of Technology, Fuzhou 344000, China
3.
School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
4.
China Resources New Energy Group Co., Ltd., Beijing 100005, China

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Abstract

The abundant phosphate in a high level nuclear waste repository will influence the migration of radionuclides. Thus, the effect of phosphate on the diffusion behavior of Se(Ⅳ) in Gaomiaozi (GMZ) bentonite was investigated by through-diffusion method. The diffusion parameters like effective diffusion coefficient (D_e) and rock capacity factor (α) were determined by house-made code named Fitting for Diffusion Parameters. The D_eand α values were about (0.61-1.3)×10^-11 m²/s and 0.16-0.58, respectively. It shows that the concentration of phosphate has insignificant effect on Se(Ⅳ) diffusion. Under acidic condition, both of D_eand α increased. The apparent diffusion coefficient (D_a) value decreased because Se(Ⅳ) could be sorbed on the surface of bentonite. Since α was less than the total porosity, it could not be sorbed on bentonite.
- diffusion,
- Se(Ⅳ),
- bentonite,
- high level nuclear waste repository

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