应对同时对和进行破坏性测试的挑战:高度精确,坚固,通用和无反应物的差分脉冲电压测量方法在可生物降解的甲硫酸介质中进行开发
Ashutosh Srivastava1, Shiny S Kumar1, Ayan Ghosh2
1Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Analytical chemistry
|August 31, 2024
概括
一种新方法使用甲硫酸 (MSA) 同时确定核燃料中的 (U) 和 (Pu). 这避免了复杂的步骤,为质量控制提供了精确和通用的测试方法.
科学领域:
- 分析化学 分析化学
- 核化学 核化学 核化学
- 电化学 电化学 电化学
背景情况:
- 精确的 (U) 和 (Pu) 测定对于核燃料质量控制和核核核算至关重要.
- 现有的同时U和Pu测定方法受到水性介质挑战的限制,包括多个氧化状态和复杂的样本准备.
- 需要一种强大的,独立于矩阵的方法来同时确定U和Pu.
研究的目的:
- 开发一种通用,同时破坏性测定方法,用于各种燃料矩阵中的和.
- 解决现有的水基分析方法的局限性.
- 使用非水性甲硫酸 (MSA) 作为溶剂和分析介质,用于简化样本处理.
主要方法:
- 多种核燃料矩阵 (例如 (U,Pu) C, (U,Pu) O2) 在可生物降解的甲硫酸 (MSA) 中的定量溶解.
- 在MSA中使用紫外线可见光谱光学和电学对U和Pu的氧还原特异化分析.
- 使用X射线吸收光谱学和密度函数理论进行结构和结合性研究.
- 开发和验证使用裸玻璃碳 (GC) 电极的微分脉冲电压测量 (DPV) 测定方法.
主要成果:
- 在没有添加剂的情况下,MSA有效地溶解了各种燃料矩阵,使U稳定为U (VI) 和Pu (IV).
- 谱学和计算研究阐明了MSA与U和Pu的双度协调.
- 开发的DPV方法证明了U和Pu的优秀分析值,包括低检测极限 (∼10−5M),高精度 (∼0.2%) 和精度 (∼0.2%).
- 该方法显示了高灵敏度,可重复性和针对相关干扰的稳定性,并与实际燃料样本进行了验证.
结论:
- 在非水性MSA介质中成功证明了U和Pu的通用,同时破坏性检测方法.
- 这种基于DPV的方法使用商业GC电极,为现有的多步骤技术提供了简单,高效和精确的替代方案.
- 这些发现为改善核材料会计和核工业质量控制铺平了道路.
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