AL
Rapid, automated gas analysis finds numerous applications. High-throughput sample bag analy- sis is applicable to the occupational safety and stack gas-testing industries. Fast canister analysis provides new opportunities for wide-scale ambi- ent monitoring, indoor air-quality testing, process gas analysis and comprehensive odor analysis (including aldehydes, amines, organosulfurs and volatile fatty acids). Entire laboratory workflows can be restructured, since the fast analysis and wide linear and dynamic ranges of SIFT-MS mean that it can be applied to prescreening of incoming samples and evaluating the cleanliness of canisters.
Continuous headspace analysis
(CHA) Chromatographic techniques are highly im- practical probes of dynamic processes, because they require that multiple instantaneous sam- ples be taken, followed by prolonged analysis. As a direct analysis technique, SIFT-MS makes monitoring dynamic processes simple due to the high time resolution, high sensitivity and comprehensive analysis via multiple reagent ions. When coupled with automation, samples can be run 24 hours/day, speeding up research and development or QA testing. This applica- tion is illustrated in Figure 5, where release of fragrance compounds from a topical muscle cream is monitored over a four-hour period. In this product, dramatic changes in fragrance composition occur over time. Using these insights, the product development process is enhanced through previously unavailable quantitative data. Applications of CHA include analyzing long-term fragrance or aroma chang- es, analyzing absorption of VOCs by “scrubbing” materials and monitoring the progress of reac- tions in chemical processes.
Conclusion SIFT-MS provides highly sensitive, selective and
nondiscriminatory analysis. When coupled with autosampler technology, it delivers unparal- leled sample throughput.
References 1. Smith, D.; Spanel, P. Selected ion flow
tube mass spectrometry (SIFT-MS) for
on-line trace gas analysis. Mass Spec. Rev. 2005, 24, 661.
AMERICAN LABORATORY
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2. Prince, B.J.; Milligan, D.B. et al. Applications of selected ion flow tube mass spectrom- etry to real-time atmospheric monitoring. Rapid Commun. Mass Spectrom. 2010, 24, 343.
3. Langford, V.S.; Graves, I. et al. Rapid mon- itoring of volatile organic compounds: a comparison between gas chromatography/ mass spectrometry and selected ion flow tube mass spectrometry. Rapid Commun. Mass Spectrom. 2014, 28, 10.
Mark J. Perkins, Ph.D., is senior applications chemist, Anatune Limited, Cambridge, U.K. Vaughan S. Langford, Ph.D., is director of appli- cations, Syft Technologies Limited, 3 Craft Pl., Middleton, Christchurch 8024, New Zealand; tel.: 64 3 338 6701; e-mail:
vaughan.langford@syft. com;
www.syft.com. Murray J. McEwan, Ph.D., is Professor Emeritus, Department of Chemis- try, University of Canterbury, Christchurch, New Zealand, and Syft Technologies Limited.
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