Development of an in-situ monitoring tool for Actinide ions

锕系离子原位监测工具的开发

• 批准号: 2908920
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2908920
• 关键词: Development; situ; monitoring; tool; Actinide

HypothesesIn aqueous solutions, actinides such as U, Np and Pu are encountered as ions which absorb intensely in the ultraviolet, visible and/or near infrared region of the electromagnetic spectrum. This indicates that illumination will result in the photoexcitation of each of those ions by promotion of an electron which may be captured by co-localised electrode either directly (photophysical-electrochemical mechanism) or indirectly via the use of an electron scavenger that effectively acts to extend the lifetime of the photoexcited species (photophysical-chemical-electrochemical mechanism). The MORE's design is built around an optical fibre light guide, which enables it to deliver monochromated light to the interrogation volume where the gold ring electrode surrounding the light guide is ideally located to electrochemically detect the often short-lived photoexcited species or the product of its decay or quenching. The fine-tuning capabilities afforded by (i) monochromated light and (ii) the electrode's working potential, allow to identify analytes based on their photophysical and electrochemical properties. The MORE has been shown capable of detecting small amounts (down to 200 nmol dm-3) of photo-electroactive analytes in solution. Crucially, it was found that the amplitude of the photocurrent is dependent on the wavelength of illumination and closely matches the absorption spectrum for the analyte. Thus, it can be used to interrogate the individual concentrations of analytes in mixtures whose spectroscopic properties are sufficiently distinct. Aims The main aim of this project is to develop a methodology to fully characterise aqueous solutions containing a range of target analytes including U, Pu and Np using the Micro-Optical Ring Electrode.Supervisor: Dr Fabrice Andrieux

假设在水溶液中，锕系元素如U、Np和Pu以离子的形式出现，这些离子在电磁光谱的紫外线、可见光和/或近红外区域强烈吸收。这表明照明将通过促进电子而导致这些离子中的每一个的光激发，所述电子可以直接地（电化学-电化学机制）或间接地经由使用有效地起作用以延长光激发物质的寿命的电子清除剂而被共定位电极捕获（电化学-化学-电化学机制）。MORE的设计是围绕光纤光导构建的，这使其能够将单色光传递到询问体积，其中围绕光导的金环电极理想地位于电化学检测通常寿命短的光激发物质或其衰减或淬灭的产物。（i）单色光和（ii）电极的工作电位提供的微调能力允许基于分析物的物理和电化学性质来识别分析物。MORE已被证明能够检测溶液中少量（低至200 nmol dm-3）的光电活性分析物。至关重要的是，发现光电流的幅度取决于照明的波长，并且与分析物的吸收光谱紧密匹配。因此，它可以用来询问的光谱特性是足够不同的混合物中的分析物的个别浓度。目的本项目的主要目的是开发一种方法，使用微光学环形电极完全溶解含有一系列目标分析物（包括U，Pu和Np）的水溶液。主管：Dr Fabrice Andrieux