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Selected-ion flow-tube mass spectrometry (SIFT-MS) is a quantitative mass spectrometry technique for trace gas analysis which involves the chemical ionization of trace volatile compounds by selected positive precursor ions during a well-defined time period along a flow tube. Absolute concentrations of trace compounds present in air, breath or the headspace of bottled liquid samples can be calculated in real time from the ratio of the precursor and product ion signal ratios, without the need for sample preparation or calibration with standard mixtures. The detection limit of commercially available SIFT-MS instruments extends to the single digit pptv range.

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  • Selected ion flow tube mass spectrometry (SIFT-MS), česky hmotnostní spektrometrie v proudové trubici s vybranými ionty, je založena na chemické ionizaci během přesně definovaného reakčního času a umožňuje tak přesné a citlivé stanovení stopových koncentrací látek přítomných ve vzduchu (v koncentracích 10−9 a větších). Výhodou SIFT-MS ve srovnání s jednodušší a je možnost volby několika prekursorů (reagentových iontů). SIFT-MS je používána pro měření koncentrací stopových koncentrací těkavých metabolitů v lidském dechu. (cs)
  • Selected-ion flow-tube mass spectrometry (SIFT-MS) is a quantitative mass spectrometry technique for trace gas analysis which involves the chemical ionization of trace volatile compounds by selected positive precursor ions during a well-defined time period along a flow tube. Absolute concentrations of trace compounds present in air, breath or the headspace of bottled liquid samples can be calculated in real time from the ratio of the precursor and product ion signal ratios, without the need for sample preparation or calibration with standard mixtures. The detection limit of commercially available SIFT-MS instruments extends to the single digit pptv range. The instrument is an extension of the selected ion flow tube, SIFT, technique, which was first described in 1976 by Adams and Smith. It is a fast flow tube/ion swarm method to react positive or negative ions with atoms and molecules under truly thermalised conditions over a wide range of temperatures. It has been used extensively to study ion-molecule reaction kinetics. Its application to ionospheric and interstellar ion chemistry over a 20-year period has been crucial to the advancement and understanding of these topics. SIFT-MS was initially developed for use in human breath analysis, and has shown great promise as a non-invasive tool for physiological monitoring and disease diagnosis. It has since shown potential for use across a wide variety of fields, particularly in the life sciences, such as agriculture and animal husbandry, environmental research and food technology. SIFT-MS has been popularised as a technology which is sold and marketed by based in Christchurch, New Zealand. (en)
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  • Selected ion flow tube mass spectrometry (SIFT-MS), česky hmotnostní spektrometrie v proudové trubici s vybranými ionty, je založena na chemické ionizaci během přesně definovaného reakčního času a umožňuje tak přesné a citlivé stanovení stopových koncentrací látek přítomných ve vzduchu (v koncentracích 10−9 a větších). Výhodou SIFT-MS ve srovnání s jednodušší a je možnost volby několika prekursorů (reagentových iontů). SIFT-MS je používána pro měření koncentrací stopových koncentrací těkavých metabolitů v lidském dechu. (cs)
  • Selected-ion flow-tube mass spectrometry (SIFT-MS) is a quantitative mass spectrometry technique for trace gas analysis which involves the chemical ionization of trace volatile compounds by selected positive precursor ions during a well-defined time period along a flow tube. Absolute concentrations of trace compounds present in air, breath or the headspace of bottled liquid samples can be calculated in real time from the ratio of the precursor and product ion signal ratios, without the need for sample preparation or calibration with standard mixtures. The detection limit of commercially available SIFT-MS instruments extends to the single digit pptv range. (en)
rdfs:label
  • SIFT-MS (cs)
  • Selected-ion flow-tube mass spectrometry (en)
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