ウランの微小スケール分離技術の開発

Development of microscale separation technique for uranium

大内 和希  ; 武藤 由樹*; Brandt, A.*; 生田目 望*; 塚原 剛彦*; 北辻 章浩  

Ouchi, Kazuki; Muto, Yuki*; Brandt, A.*; Nabatame, Nozomi*; Tsukahara, Takehiko*; Kitatsuji, Yoshihiro

迅速・安全な放射性廃棄物分析法の開発のためマイクロ化学チップに陰イオン交換樹脂を充填して作製したマイクロチップカラム(長さ11mm、カラム容量0.39L)によるウランの吸着・溶出性能を調べた。ランタノイドとウランの混合試料を送液速度1mlhでカラムを通液すると、ウランを選択的に吸着・溶出でき、その操作時間は約4分であり数十分要する一般的なカラムより迅速にウランを分離できることがわかった。また、標準海水のウラン分離に適用し分析値(2.860.05ppb)は認証値(2.810.16)とよく一致し実証試験に成功した。

The adsorption and elution performance of uranium with the microchip column (length 11 mm, column volume 0.39 L) loaded an anion exchange resin for faster and safer radioactive waste analysis were investigated. When a mixed sample of lanthanides and uranium was flown on the microchip column at the feed rate of 1 ml h, uranium could be selectively adsorbed and eluted in about 4 minutes of operation time. This was faster than a conventional column which took several tens of minutes. When this column was applied to uranium separation of the standard seawater, the uranium concentration was determined to be 2.860.05 ppb, which was in good agreement with the certified value (2.810.16 ppb). Therefore, the verification test was successful.