Performance and optimisation of triple quadrupole ICP-MS for accurate measurement of uranium isotopic ratios,Journal of Analytical Atomic Spectrometry

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Performance and optimisation of triple quadrupole ICP-MS for accurate measurement of uranium isotopic ratios
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2021-08-19 , DOI: 10.1039/d1ja00177a
Patric Lindahl ₁ , Grzegorz Olszewski _{2,

3} , Mats Eriksson ₃

Affiliation

The performance characteristics of the Agilent 8900 triple quadrupole inductively coupled plasma mass spectrometry (ICP-MS/MS) system were evaluated and optimised concerning stability in measurements of uranium isotopic ratios. Multiple measurement parameters were evaluated for the determination of U isotopic ratios in certified standard solutions containing ²³³U, ²³⁵U and ²³⁸U. Large irregular biases during repeated measurements of U isotopic ratios were observed using two identical ICP-MS/MS instruments. Depending on the mass filter resolution settings, the accuracy of U isotopic ratios can deviate up to 100% from the certified reference value. These variations in U isotopic ratios are primarily recognised as irregular drifts in the mass calibration of the two mass filters. This mass calibration drift is dependent on the isotope mass with a more pronounced drift for heavier isotopes. In order to solve the problem the resolution settings were optimised for both mass filters, which resulted in considerable improvement in precision and accuracy. A precision of 0.07% (relative standard deviation) for long-term measurement of ²³³U/²³⁵U ratios was achieved. Mass bias corrected U isotopic ratios agree very well with certified reference values with overall relative deviations from reference values of 0.005% and 0.17% for the SQ mode and MS/MS mode, respectively. The impact of the first mass filter in the MS/MS mode has a significant effect on the mass bias discrimination process and hence the accuracy of U isotopic ratios.

中文翻译：

用于准确测量铀同位素比率的三重四极杆 ICP-MS 的性能和优化

对 Agilent 8900 三重四极杆电感耦合等离子体质谱 (ICP-MS/MS) 系统的性能特征进行了评估并优化了铀同位素比率测量的稳定性。为确定含有²³³ U、²³⁵ U 和^{238 的}认证标准溶液中的 U 同位素比率，评估了多个测量参数U. 使用两台相同的 ICP-MS/MS 仪器在重复测量 U 同位素比率期间观察到较大的不规则偏差。根据质量过滤器分辨率设置的不同，U 同位素比率的准确度可能与认证参考值的偏差高达 100%。U 同位素比率的这些变化主要被认为是两个质量过滤器的质量校准中的不规则漂移。这种质量校准漂移取决于同位素质量，对于较重的同位素，漂移更明显。为了解决这个问题，我们对两个质量过滤器的分辨率设置进行了优化，从而显着提高了精度和准确度。²³³ U/ ^{235 的}长期测量精度为 0.07%（相对标准偏差）达到了 U 比率。质量偏差校正后的 U 同位素比率与标准参考值非常吻合，SQ 模式和 MS/MS 模式与参考值的总体相对偏差分别为 0.005% 和 0.17%。MS/MS 模式中第一个质量过滤器的影响对质量偏差鉴别过程有显着影响，因此对 U 同位素比率的准确性有显着影响。

更新日期：2021-09-02

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