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Unami, Kensuke*; Fukushi, Keisuke*; Takahashi, Yoshio*; Itaya, Tetsumaru*; Niwa, Masakazu
no journal, ,
K-Ar dating is generally not applicable to smectite, which is potassium-free clay mineral. However, based on multidisciplinary analyses such as XRD, TEM, exchangeable cation analysis, and XAFS, fixed potassium can exists in clay minerals in which only smectite is identified by XRD analysis.
Tokunaga, Kohei; Kozai, Naofumi; Takahashi, Yoshio*
no journal, ,
no abstracts in English
Yaita, Tsuyoshi
no journal, ,
no abstracts in English
Tanaka, Kazuya; Kozai, Naofumi; Yamaji, Keiko*; Masuya, Hayato*; Grambow, B.
no journal, ,
Radium-226 is of serious concern in Ningyo-toge Environmental Engineering Center because its radioactive concentration in mining wastewater exceeds the effluent standard. In this study, we examined Ba and Sr adsorption on biogenic Mn oxide as a preliminary surrogate for Ra adsorption. Both Ba and Sr show the dependence of adsorption on NaCl concentration. Overall, Ba gave an order of magnitude higher Kd values than Sr. Adsorption behavior of Ra would be similar to that of Ba in terms of ionic radius. Barium showed Kd value greater than 10
mL/g in 10 mM NaCl solution, similar to the ionic strength of the fresh water system in the Ningyo-toge center. Therefore, it is expected that the biogenic Mn can work effectively for removal of Ra from mining wastewater.