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Development of a rapid, solvent extraction based radioanalytical technique for monitoring low-level actinide concentrations in water supplies.

机译:快速,基于溶剂萃取的放射分析技术的开发,用于监测供水中低水平的act系元素浓度。

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摘要

A rapid radiochemical method for the concentration and subsequent analysis of radionuclides from large volume aqueous samples has been developed by using solvent extraction (SX) followed by quantification via liquid scintillation counting (LSC). This was accomplished using simple radiochemical techniques that resulted in the ability to enact a 200x concentration factor and rapidly detect whether radionuclides are present in dilute aqueous samples. The proposed method has average Minimum Detectable Concentrations (MDC) for 238 Pu and 233U of 3.5x10-2 Bq/L and 0.16 Bq/L, which equates to 2.3x10-16 and 2.0x10 -12 mol/L, respectively. The MDC value for plutonium is an order of magnitude lower than the value set by the Environmental Protection Agency (EPA) for the Safe Water Drinking Act (SWDA), which establishes a Maximum Contaminant Level (MCL) of 15 pCi/L (0.55 Bq/L) for gross alpha activity. Due to the simple nature of the procedure and relatively low cost of the analysis, this procedure is intended for use by technicians to monitor the potential presence of actinides in water treatment systems. Overall, the procedure described below will result in a "yes"/"no" determination of the presence of plutonium in a water sample. If further analyses are warranted to determine the specific radionuclides involved or isotope ratios, back extraction of the actinides from the organic phase must be possible.
机译:通过使用溶剂萃取(SX),然后通过液体闪烁计数(LSC)进行定量,已经开发了一种快速放射化学方法,用于浓缩和随后分析大体积含水样品中的放射性核素。这是通过使用简单的放射化学技术完成的,该技术具有制定200倍浓度因子并快速检测稀水溶液样品中是否存在放射性核素的能力。所提出的方法对于238 Pu和233U的平均最小可检测浓度(MDC)分别为3.5x10-2 Bq / L和0.16 Bq / L,分别相当于2.3x10-16和2.0x10 -12 mol / L。 DC的MDC值比环境保护局(EPA)为《安全饮水法》(SWDA)设定的值低一个数量级,后者规定最大污染物水平(MCL)为15 pCi / L(0.55 Bq) / L)表示总的alpha活动。由于该过程的简单性质和相对较低的分析成本,该过程旨在供技术人员用来监视水处理系统中of系元素的潜在存在。总体而言,以下描述的过程将导致对水样中the的存在进行“是” /“否”确定。如果需要进一步分析以确定所涉及的特定放射性核素或同位素比,则必须有可能从有机相中反萃取act系元素。

著录项

  • 作者

    Jablonski, Joseph Gerard.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Environmental Health.;Engineering Environmental.;Chemistry Inorganic.
  • 学位 M.S.
  • 年度 2012
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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