A Field-Portable Membrane Introduction Mass Spectrometer for Real-time Quantitation and Spatial Mapping of Atmospheric and Aqueous Contaminants

• Published in: Journal of the American Society for Mass Spectrometry Vol. 26; no. 2; pp. 212 - 223
• Main Authors: Bell, Ryan J., Davey, Nicholas G., Martinsen, Morten, Collin-Hansen, Christian, Krogh, Erik T., Gill, Christopher G.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-02-2015; Springer Nature B.V
• Subjects: Adaptive sampling; Air Pollutants - analysis; Alberta; Analytical Chemistry; Bioinformatics; Biotechnology; Chemistry; Chemistry and Materials Science; Contaminants; Data processing; Environmental monitoring; Environmental Monitoring - instrumentation; Environmental Monitoring - methods; Equipment Design; Focus: Harsh Environment and Field-Portable Mass Spectrometry: Research Article; Internet; Ionization; Mass spectrometry; Membranes, Artificial; Organic Chemistry; Organic compounds; Pollution monitoring; Polydimethylsiloxane; Proteomics; Real time; Scientific imaging; Software; Spectroscopy; Tandem Mass Spectrometry - instrumentation; Tandem Mass Spectrometry - methods; Temporal resolution; Toluene - analysis; VOCs; Volatile organic compounds; Volatile Organic Compounds - analysis; Water Pollutants, Chemical - analysis; Water sampling; Alberta; Membrane introduction mass spectrometry (MIMS); Mobile mass spectrometry; Real time quantitative mapping; VOC/SVOC; Emissions; Alberta oil sands
• ISSN: 1044-0305; 1879-1123
• DOI: 10.1007/s13361-014-1028-3

Environmental concentrations of volatile and semivolatile organic compounds (VOC/SVOCs) can vary dramatically in time and space under the influence of environmental conditions. In an industrial setting, multiple point and diffuse sources can contribute to fugitive emissions. Assessments and monitoring programs using periodic grab sampling provide limited information, often with delay times of days or weeks. We report the development and use of a novel, portable membrane introduction mass spectrometry (MIMS) system capable of resolving and quantifying VOC and SVOCs with high spatial and temporal resolution, in the field, in real-time. An electron impact ionization cylindrical ion trap mass spectrometer modified with a capillary hollow fiber polydimethylsiloxane membrane interface was used for continuous air and water sampling. Tandem mass spectrometry and selected ion monitoring scans performed in series allowed for the quantitation of target analytes, and full scan mode was used to survey for unexpected analytes. Predeployment and in-field external calibrations were combined with a continuously infused internal standard to enable real-time quantitation and monitor instrument performance. The system was operated in a moving vehicle with internet-linked data processing and storage. Software development to integrate MIMS and relevant meta-data for visualization and geospatial presentation in Google Earth is presented. Continuous quantitation enables the capture of transient events that may be missed or under-represented by traditional grab sampling strategies. Real-time geospatial maps of chemical concentration enable adaptive sampling and in-field decision support. Sample datasets presented in this work were collected in Northern Alberta in 2010–2012.
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