Abstract
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, N2, O2, CO2) 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 m/z ratios may result from overlapping signals of multiple species (for example CH4, O2 and N2 at m/z=15 and 16; or Ne, Ar and H2O at m/z=20).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.
Highlights
Method ArticleThe 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 quantification of the gas species, the miniRUEDI system uses a quadrupole mass spectrometer (Stanford Research Systems RGA200, m/z resolution ≤ 0.5 amu), which is equipped with a Faraday cup (FC) detector and an electron multiplier (EM) detector
The procedures for deconvolution and compensation of the interferences were integrated in the open source software for miniRUEDI instrument control and data processing [17] in order to facilitate the adoption of the new method in miniRUEDI field applications
Summary
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. We present a method extension to the existing miniRUEDI peak-height comparison in order to resolve such overlap interferences:. The method substantially improves the analytical accuracy in situations where mass-spectrometric interferences cannot be avoided. Method name: miniRUEDI Keywords: Isobaric ions, Environmental gases, ruediPy Article history: Received 15 June 2020; Accepted 17 August 2020; Available online 21 August 2020. Subject Area: More specific subject area: Method name: Name and reference of original method: Resource availability: Environmental Science On-site analysis of gases in the environment using a portable mass spectrometer miniRUEDI M. A portable and autonomous mass spectrometric system for on-site environmental gas analysis, Environmental Science and Technology 50 (24) (2016) 13455–13463. A portable and autonomous mass spectrometric system for on-site environmental gas analysis, Environmental Science and Technology 50 (24) (2016) 13455–13463. doi:10.1021/acs.est.6b03669. https://github.com/brennmat/ruediPy
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