Determination of trace amounts of plutonium in low-active liquid wastes from spent nuclear-fuel reprocessing plants by flow injection-based solid-phase extraction/electrochemical detection system

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• 作者：Shigeo Taguchi (1) taguchi.shigeo@jaea.go.jp
  Masahiko Yamamoto (1)
  Naoki Surugaya (1)
  Akira Kurosawa (1)
  Toshiaki Hiyama (1)
  Tatsuhiko Tanaka (2)
• 关键词：Plutonium &#8211 ; Nuclear waste &#8211 ; Electrochemical detection &#8211 ; Solid ; phase extraction &#8211 ; Determination &#8211 ; Flow injection analysis
• 刊名：Journal of Radioanalytical and Nuclear Chemistry
• 出版时间：May 2011
• 出版年：2011
• 期刊代码：48_02365731
• 类别：ch
• 卷：288
• 期：2
• 页码：435-441
• 数据来源：sp

摘要

A flow injection-based electrochemical detection system coupled to a solid-phase extraction column was developed for the determination of trace amounts of plutonium in low-active liquid wastes from spent nuclear-fuel reprocessing plants. The oxidation state of plutonium in a sample solution was adjusted to Pu(VI) by the addition of silver(II) oxide. A sample solution was made up in 3 mol L−1 HNO₃ and loaded onto a column packed with UTEVA庐 with 3 mol L−1 HNO₃ as the carrier. Plutonium(VI) was adsorbed onto the resin, and interfering elements were removed by rinsing the column with 3 mol L−1 HNO₃. Subsequently, the adsorbed Pu(VI) was eluted with 0.01 mol L−1 HNO₃, and then introduced directly into the flow-through electrolysis cell with boron-doped diamond electrode. The eluted Pu(VI) was detected by an electrochemical amperometric method at a working potential of 0.1 V (vs. Ag/AgCl). The current produced on reduction of Pu(VI) was continuously monitored and recorded. The plutonium concentration was calculated from the relationship between the peak area and concentration of plutonium. The relative standard deviation of ten analyses was 1.1%for a plutonium solution of 25 μg L−1 containing 50 ng of Pu. The detection limit calculated from three-times the standard deviation was 0.82 μg L−1 (1.6 ng of Pu).