Brennwald Matthias S, Tomonaga Yama, Kipfer Rolf
Department of Water Resources and Drinking Water, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.
Department of Earth Sciences, Swiss Federal Institute of Technology in Zurich, Institute of Geochemistry and Petrology, Switzerland.
MethodsX. 2020 Aug 21;7:101038. doi: 10.1016/j.mex.2020.101038. eCollection 2020.
The miniRUEDI is a portable mass spectrometer system designed for on-site analysis of gases in the environment during field work and at remote locations. For many gas species (e.g., He, Ar, Kr, N, O, CO) the ion-current peak-heights measured with the mass spectrometer can usually be calibrated in terms of the partial pressures by simple peak-height comparison relative to a gas standard with well known partial pressures. However, depending on the composition of the analysed gases, the ion currents measured at certain / ratios may result from overlapping signals of multiple species (for example CH, O and N at and 16; or Ne, Ar and HO at ). Here, we present a method extension to the existing miniRUEDI peak-height comparison in order to resolve such overlap interferences: • We developed and tested a data processing procedure for accurate deconvolution and compensation of such mass-spectrometric overlap interferences. • The method was incorporated into the miniRUEDI open-source software (ruediPy). • The method substantially improves the analytical accuracy in situations where mass-spectrometric interferences cannot be avoided.
小型RUEDI是一种便携式质谱仪系统，设计用于在野外工作和偏远地区对环境中的气体进行现场分析。对于许多气体种类（例如氦气、氩气、氪气、氮气、氧气、一氧化碳），使用质谱仪测量的离子流峰高通常可以通过相对于具有已知分压的气体标准物进行简单的峰高比较，根据分压进行校准。然而，根据所分析气体的组成，在某些特定质荷比下测量的离子流可能是多种物质重叠信号的结果（例如，在质荷比为12和16时的甲烷、氧气和氮气；或者在质荷比为20时的氖气、氩气和水）。在此，我们提出一种对现有小型RUEDI峰高比较方法的扩展，以解决此类重叠干扰：
我们开发并测试了一种数据处理程序，用于对这种质谱重叠干扰进行精确解卷积和补偿。
该方法已被纳入小型RUEDI开源软件（ruediPy）。
在无法避免质谱干扰的情况下，该方法可大幅提高分析精度。
