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High-precision analysis of 182 W/ 184 W and 183 W/ 184 W by negative thermal ionization mass spectrometry: Per-integration oxide corrections using measured 18 O/ 16 O
International Journal of Mass Spectrometry ( IF 1.8 ) Pub Date : 2017-03-01 , DOI: 10.1016/j.ijms.2017.01.002
Gregory J Archer 1 , Andrea Mundl 1 , Richard J Walker 1 , Emily A Worsham 1 , Katherine R Bermingham 1
Affiliation  

Here we describe a new analytical technique for the high-precision measurement of 182W/184W and 183W/184W using negative thermal ionization mass spectrometry (N-TIMS). We improve on the recently reported method of Trinquier et al. (2016), which described using Faraday cup collectors coupled with amplifiers utilizing 1013 Ω resistors to continuously monitor the 18O/16O of WO3 - and make per-integration oxide corrections. In our study, we report and utilize a newly measured oxygen mass fractionation line, as well as average 17O/16O and 18O/16O, which allow for more accurate per-integration oxide interference corrections. We also report a Faraday cup and amplifier configuration that allows 18O/16O to be continuously monitored for WO3 - and ReO3 -, both of which are ionized during analyses of W using Re ribbon. The long-term external precision of 182W/184W is 5.7 ppm and 3.7 ppm (2SD) when mass bias corrected using 186W/184W and 186W/183W, respectively. For 183W/184W mass bias is corrected using 186W/184W, yielding a long-term external precision of 6.6 ppm. An observed, correlated variation in 182W/184W and 183W/184W, when mass bias corrected using 186W/184W, is most likely the result of Faraday cup degradation over months-long intervals.

中文翻译:

通过负热电离质谱法对 182 W/ 184 W 和 183 W/ 184 W 进行高精度分析:使用测量的 18 O/ 16 O 进行每次积分氧化物校正

在这里,我们描述了一种使用负热电离质谱 (N-TIMS) 高精度测量 182W/184W 和 183W/184W 的新分析技术。我们改进了 Trinquier 等人最近报道的方法。(2016),其中描述了使用法拉第杯集电极与放大器相结合,利用 1013 Ω 电阻器来连续监测 WO3 的 18O/16O,并进行每次积分氧化物校正。在我们的研究中,我们报告并利用了新测量的氧质量分馏线,以及平均 17O/16O 和 18O/16O,这允许更准确的每次积分氧化物干扰校正。我们还报告了法拉第杯和放大器配置,可连续监测 18O/16O 中的 WO3 - 和 ReO3 -,这两种物质在使用 Re 带分析 W 时都会被电离。当使用 186W/184W 和 186W/183W 校正质量偏差时,182W/184W 的长期外部精度分别为 5.7 ppm 和 3.7 ppm (2SD)。对于 183W/184W,使用 186W/184W 校正质量偏差,产生 6.6 ppm 的长期外部精度。当使用 186W/184W 校正质量偏差时,观察到的 182W/184W 和 183W/184W 的相关变化很可能是法拉第杯在数月的时间间隔内退化的结果。
更新日期:2017-03-01
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