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首页> 外文期刊>Journal of Analytical Atomic Spectrometry >'Blind time' - current limitations on laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) for ultra-transient signal isotope ratio analysis and application to individual sub-micron sized uranium particles
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'Blind time' - current limitations on laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) for ultra-transient signal isotope ratio analysis and application to individual sub-micron sized uranium particles

机译:“盲时间” - 对激光消融多集聚器电感耦合等离子体质谱(LA-MC-ICP-MS)的电流限制,用于超瞬态信号同位素比分析和应用于各个亚微米尺寸铀粒子的应用

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摘要

The application of laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) to the isotope ratio analysis of UO_X particles has the potential to improve the isotopic determination of these particles when compared to currently utilised ICP-MS techniques. To investigate this a high-speed, integrated ablation cell and dual concentric injector design was tested in the expectation that the resulting increase in signal to noise ratio and sample ion yield would improve the determination of ~(234)U/~(238)U, ~(235)U/~(238)U and ~(236)U/~(238)U for such materials. However, when compared to a slower washout, more established low-volume cell design, the highly transient signals of the new design proved challenging for the mixed detector array of the multi-collector mass spectrometer, introducing a new bias. We describe a major component of this bias, referred to as 'blind time', and model its impact on UO_X particle analysis. After accounting for blind time, average precisions for the uranium isotopic composition of sub-micron sized UO_X particles using LA-MC-ICP-MS were 3% 1RSD for ~(235)U/~(238)U and 8% 1RSD for ~(234)U/~(238)U. When ablating a glass rather than a UO_X particle, uncertainties of 1.3% 1RSD for ~(235)U/~(238)U were achieved for 150 ran equivalent particle sizes using LA-MC-ICP-MS.
机译:激光烧蚀多集聚器的电感耦合等离子体质谱(La-MC-ICP-MS)与UO_x颗粒的同位素比分析有可能改善与当前使用ICP-MS技术相比这些颗粒的同位素测定。为了研究这种高速,集成的消融电池和双同心注射器设计在期望的情况下,所得信噪比和样品离子产量的产生增加将改善〜(234)U /〜(238)U的测定,〜(235)U /〜(238)u和〜(236)U /〜(238)U用于此类材料。然而,与较慢的冲洗室相比,更熟悉的低容量电池设计,新设计的高瞬态信号证明了多收集器质谱仪的混合探测器阵列的具有挑战性,引入了新的偏压。我们描述了这种偏见的主要组成部分,称为“盲时”,并模拟其对UO_X粒子分析的影响。遵守盲时间后,使用LA-MC-ICP-MS的亚微米尺寸UO_X颗粒的铀同位素组成的平均矫反3%1RSD〜(235)U /〜(238)U和8%1RSD〜 (234)U /〜(238)u。当烧蚀玻璃而不是UO_X颗粒时,使用La-MC-ICP-MS实现150个ran等效粒度的1.3%1RSD的不确定性。

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  • 来源
    《Journal of Analytical Atomic Spectrometry》 |2020年第5期|1011-1021|共11页
  • 作者单位

    Centre for Analytical Science Department of Chemistry Loughborough University Loughborough Leicestershire LE11 3TU UK Thermo Fisher Scientific Bremen GmbH Hanna-Kunath Str. 11 28359 Bremen Germany;

    NERC Isotope Geosciences Laboratory British Geological Survey Nicker Hill Keyworth Nottinghamshire NG12 5GG UK;

    Centre for Analytical Science Department of Chemistry Loughborough University Loughborough Leicestershire LE11 3TU UK;

    Centre for Analytical Science Department of Chemistry Loughborough University Loughborough Leicestershire LE11 3TU UK;

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