Abstract:
129I is an important fission product which is easy to be released into the environment by the nuclear power plants. Its movement in environment causes a lot of attention all around the world. In this work, the migration of
125I (as a substitute of
129I) in Beishan granite was studied by an inject-pulse column method. The results show that the dominant mechanisms of iodine migration are convection and dispersion. The dispersion coefficient (
D) of iodine increases with the increase of the flow velocity or the decrease with pH. The change tendency of D with pH is coincide with the surface charge distribution of Beishan granite. D is 3.29×10-5m2·min-1 when flow velocity is 0.07 mL·min-1 and pH is 8.0. This result verifies the conclusion that dispersion coefficient only relates to the migration media.
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