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[en] Here we report the sorption behaviors of IO3- species on the several sorbents involving activated carbon, CeO2-modified activated carbon, Ag-attached zeolite, titanate attached activated carbon, and MgO. In addition, the solidification of IO3- with alkaline-activated metakaolin (AAMK), so-called geopolymer, were studied. We measured distribution coefficients by the sorbents, leaching behavior from the I doped AAMK into a distilled water and into a sea water. We analyzed chemical species of IO3- in sorbents and AAMK by XANES using synchrotron X-ray, and position of I and chemical components present with I in the sorbents and AAMK were analyzed by SEM. Sorption of IO3- showed that high distribution coefficients could be obtained in acid solution for activated carbon, CeO2-modified activated carbon, Ag-attached zeolite, and titanic acids attached activated carbon, and in alkaline solution for MgO. XANES analysis showed that the sorbed I was present as IO3-. SEM analysis dis not detect I within the sorbents. These results indicate that IO3- is associated by sorbents with outer sphere complexes. Almost all IO3- was solidified with AAMK. The leaching test showed that less than 1% of I in AAMK were released into distilled water and into sea water. The XANES spectrum of I in AAMK was nearly the same as that of the KIO3 standard, indicating that I is present as IO3- ion in AAMK. These results indicate that I as the chemical species of IO3- is well recovered by the sorbents in acid solution, and is also well solidified in AAMK.