Accurate correction for the matrix interference on laser ablation MC-ICPMS boron isotope measurements in CaCO3 and silicate matrices,Journal of Analytical Atomic Spectrometry

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Accurate correction for the matrix interference on laser ablation MC-ICPMS boron isotope measurements in CaCO3 and silicate matrices
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2021-06-09 , DOI: 10.1039/d1ja00073j
David Evans _{1,

2,

3,

4,

5} , Axel Gerdes _{1,

2,

3,

4,

5} , Douglas Coenen _{1,

2,

3,

4,

5} , Horst R. Marschall _{1,

2,

3,

4,

5} , Wolfgang Müller _{1,

2,

3,

4,

5}

Affiliation

Knowledge of the boron isotopic composition of natural samples has found wide ranging application in both low and high temperature geochemistry. More recently, the development of boron isotope measurements using highly spatially-resolved analytical techniques is of interest as it is increasingly recognised that many materials are heterogeneous with respect to their boron isotopic composition, and moreover, that this heterogeneity yields valuable information about the environment of formation and/or mechanisms of crystallisation. Here, we build on a recently proposed methodology (Standish et al. [2019] Rapid Commun. Mass Spectrom. 33:959) which enables precise and accurate δ¹¹B measurement via LA-MC-ICPMS by accounting for a scattered Ca interference primarily on ¹⁰B. We propose minor modifications to this method via the use of 10¹³ Ω preamplifiers on the Faraday cup of the detector, more precise measurement of the Ca interference, and improved modelling of the shape of this interference correction. This yields single laser spot 2SE precision of ∼0.5‰ with a 70 μm beam (∼7 pg B), ∼1.4‰ with a 40 μm beam (∼2 pg B), and a long-term (1.5 year) intermediate precision in a marble standard with 15 μg g⁻¹ [B] of <0.9‰ (2SD). Thus, spatially-resolved information comparable to that achievable via SIMS is possible. Moreover, we show theoretically and empirically that the inaccuracy predominantly resulting from a scattered Ca interference on ¹⁰B is also an issue for non-CaCO₃ matrices, despite their typically lower [Ca]. Encouragingly, building multi-standard calibration lines to correct for this interference is also a way forward for silicate glasses, and we demonstrate accurate and precise (<0.5‰ 2SE) measurement of a basaltic glass with 3 μg g⁻¹ [B] using a 74 μm diameter laser beam (<1 pg B). This paves the way forward for accurate and precise spatially-resolved δ¹¹B measurement of a diverse range of sample matrices using laser ablation as a sample introduction system for MC-ICPMS instruments that are characterised by a scattered Ca interference in the region of m/z 10–11.

中文翻译：

精确校正激光烧蚀 MC-ICPMS 中 CaCO3 和硅酸盐基质中硼同位素测量的基质干扰

对天然样品的硼同位素组成的了解在低温和高温地球化学中都有广泛的应用。最近，使用高度空间分辨分析技术进行硼同位素测量的发展引起了人们的兴趣，因为人们越来越认识到许多材料在其硼同位素组成方面是异质的，而且，这种异质性产生了关于环境的宝贵信息。结晶的形成和/或机制。在这里，我们建立在最近提出的方法（斯坦迪什等人[2019]快速COMMUN质谱Spectrom。 33：959），可实现精确和准确的δ ¹¹乙测量经由LA-MC-ICPMS 通过考虑主要在¹⁰ B上的散射 Ca 干扰。我们建议通过在检测器的法拉第杯上使用 10 ¹³ Ω 前置放大器，对 Ca 干扰进行更精确的测量，并改进此方法对该干涉校正的形状进行建模。这在 70 μm 光束 (~7 pg B) 下产生了 ~0.5‰ 的单个激光点 2SE 精度，在 40 μm 光束 (~2 pg B) 下产生了 ~1.4‰，以及长期（1.5 年）中间精度15 μg g ^-1 [B] <0.9‰ (2SD)的大理石标准。因此，空间分辨的信息可与通过获得的信息相媲美SIMS 是可能的。此外，我们从理论上和经验上表明，主要由¹⁰ B上的分散 Ca 干扰引起的不准确性对于非 CaCO ₃基质也是一个问题，尽管它们的 [Ca] 通常较低。令人鼓舞的是，建立多标准校准线来校正这种干扰也是硅酸盐玻璃的前进方向，我们证明了使用 3 μg g ^-1 [B]的玄武岩玻璃的准确和精确 (<0.5‰ 2SE) 测量74 μm 直径激光束 (<1 pg B)。这为准确和精确的空间分辨 δ ¹¹铺平了道路B 使用激光烧蚀作为 MC-ICPMS 仪器的样品引入系统测量各种样品基质，其特征是在m / z 10–11区域内散射 Ca 干扰。

更新日期：2021-06-28

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