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Characterization of saline groundwater at Horonobe, Hokkaido, Japan by SEC-UV-ICP-MS; Speciation of uranium and iodine

Kozai, Naofumi   ; Onuki, Toshihiko; Iwatsuki, Teruki  

To help elucidate the migration mechanism of radionuclides in the geological environment, this paper analyzed the colloids and ions of the saline groundwater collected at Horonobe mainly by employing SEC-UV-Vis-ICP-MS technique. This paper focused on speciation of uranium and iodine. The conventional SEC-UV-Vis-ICP-MS technique employing a single SEC column analyzed colloids only. This study succeeded in analyzing both colloids and ions by using two SEC columns with opposite surface charges. By this method, this study revealed that uranium in the groundwater was associated with low molecular weight silica species virtually free of metal elements such as Na and Al. To date, no paper has been published on naturally occurring silica as a carrier of U. This study also found that almost all of the iodine was iodide (I$$^{-}$$) and the organic colloid was not a carrier for the radioactive waste-relevant elements such as Se, Sr, Cs, and U.

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