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Environments 2017, 4(1), 16;

Negative Reagent Ions for Real Time Detection Using SIFT-MS

Syft Technologies Ltd., 3 Craft Pl, Christchurch 8242, New Zealand
Department of Chemistry, University of Canterbury, Christchurch 8140, New Zealand
Author to whom correspondence should be addressed.
Academic Editors: Ki-Hyun Kim and Abderrahim Lakhouit
Received: 17 November 2016 / Revised: 29 January 2017 / Accepted: 8 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Volatile Organic Compounds in Environment)
Full-Text   |   PDF [1220 KB, uploaded 15 February 2017]   |  


Direct analysis techniques have greatly simplified analytical methods used to monitor analytes at trace levels in air samples. One of these methods, Selected Ion Flow Tube-Mass Spectrometry (SIFT-MS), has proven to be particularly effective because of its speed and ease of use. The range of analytes accessible using the SIFT-MS technique has been extended by this work as it introduces five new negatively charged reagent ions (O, OH, O2, NO2, and NO3) from the same microwave powered ion source of moist air used to generate the reagent ions traditionally used (H3O+, NO+, and O2+). Results are presented using a nitrogen carrier gas showing the linearity with concentration of a number of analytes not readily accessible to positive reagent ions (CO2 from ppbv to 40,000 ppmv, sulfuryl fluoride and HCl). The range of analytes open to the SIFT-MS technique has been extended and selectivity enhanced using negative reagent ions to include CCl3NO2, SO2F2, HCN, CH3Cl, PH3, C2H4Br2, HF, HCl, SO2, SO3, and NO2. View Full-Text
Keywords: Selected Ion Flow Tube; VOCs; SIFT-MS; negative reagent ions; acid gases Selected Ion Flow Tube; VOCs; SIFT-MS; negative reagent ions; acid gases

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Hera, D.; Langford, V.S.; McEwan, M.J.; McKellar, T.I.; Milligan, D.B. Negative Reagent Ions for Real Time Detection Using SIFT-MS. Environments 2017, 4, 16.

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