Journal Article 107PdのICP-MS測定のためのレーザー誘起光還元法による非接触・選択的パラジウム分離ー分離条件とPd回収率の関係ー

蓬田, 匠  ,  浅井, 志保  ,  佐伯, 盛久  ,  半澤, 有希子  ,  堀田, 拓摩  ,  江坂, 文孝  ,  大場, 弘則  ,  北辻, 章浩

66 ( 9 )  , pp.647 - 652 , 2017-09 , 日本分析化学会
Description
Palladium-107 can be found in high-level radioactive liquid wastes (HLLW). Owing to its long half-life (6.5 million years), determination of the 107Pd contents in HLLW is essential to evaluate the long-term safety of HLLW repositories. However, the 107Pd contents in HLLW have not been reported because of difficulties in pretreatment for the measurement. Treating highly radioactive samples such as HLLW may cause radioactive contamination and radiation exposure to workers. Therefore, a simple and non-contact separation procedure is desirable. In this study, we applied a simple and non-contact separation technique based on laser-induced photoreduction to a simulated HLLW solution. The solution, which consists of 14 major elements (Rb, Sr, Zr, Mo, Ru, Rh, Pd, Cs, Ba, La, Ce, Pr, Nd, Sm) in a 3 mol L-1 HNO3 solution, was used to evaluate the separation performance. The results showed the recovery of Pd from a simulated HLLW solution depend on solvent, concentration of ethanol, concentrations of Pd ion, irradiation time and pulse energy. The results indicate that the coexisting elements in a sample hampered photoreduction of Pd ions or formation of Pd precipitate and the loss of Pd precipitate at centrifugation caused the decrease of Pd recovery. By considering conditions at laser irradiation, the results showed that Pd recovery reached 59% while about 99% of the other 13 elements were removed. This indicates that non-contact and high-selective separation of Pd is achievable with the proposed separation technique at the suitable separation condition

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