Results 151 to 160 of about 11,070,300 (191)
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Quantification of hydrogen sulphide in humid air by selected ion flow tube mass spectrometry
Rapid Communications in Mass Spectrometry, 2000We report the results of a study of the reactions of H(3)O(+), NO(+) and O(2)(+.) ions with H(2)S. This study was undertaken to provide a thorough understanding of the ion chemistry required for accurate quantification of H(2)S in humid air by selected ion flow tube mass spectrometry (SIFT-MS).
P, Spanel, D, Smith
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Determination of Olive Oil Oxidative Status by Selected Ion Flow Tube Mass Spectrometry
Journal of Agricultural and Food Chemistry, 2007The emergence of primary and secondary oxidation products in New Zealand extra virgin olive oil during accelerated thermal oxidation was measured and correlated with the concentrations of 13 headspace volatile compounds measured by selected ion flow tube mass spectrometry (SIFT-MS). SIFT-MS is a mass spectrometric technique that permits qualitative and
Brett M, Davis, Murray J, McEwan
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Evaluation of the performance of field olfactometers by selected ion flow tube mass spectrometry
Biosystems Engineering, 2015Odour quantification is generally performed by olfactometry, a technique which determines to what extent an odorous air sample should be diluted with odour-free air to be just distinguishable from odour-free air. In this study, the performance of two field olfactometers (Nasal Ranger and Scentroid 110c) was evaluated with respect to their ability to ...
Christophe Walgraeve +3 more
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Real‐time measurement of peroxyacetyl nitrate using selected ion flow tube mass spectrometry
Rapid Communications in Mass Spectrometry, 2010Abstract The on‐line detection of gaseous peroxyacetyl nitrate (PAN) using selected ion flow tube mass spectrometry (SIFT‐MS) has been investigated using a synthetic sample of PAN in air at a humidity of ∼30%. Using the H 3 O + reagent
Donald R, Hastie +5 more
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Selected ion flow tube mass spectrometry (SIFT‐MS) for on‐line trace gas analysis
Mass Spectrometry Reviews, 2004AbstractSelected ion flow tube mass spectrometry (SIFT‐MS) is a new analytical technique for the real‐time quantification of several trace gases simultaneously in air and breath. It relies on chemical ionization of the trace gas molecules in air/breath samples introduced into helium carrier gas using H3O+, NO+, and O precursor ions.
David, Smith, Patrik, Spanel
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Analytical Chemistry, 2020
Abstract Ion–molecule reactions (IMR) are at the very core of trace gas analyses in modern chemical ionization (CI) mass spectrometer instruments, which are increasingly being used in diverse areas of research and industry. The focus of this Perspective is on the ion chemistry that underpins gas-phase analytical CI methods.
David Smith +2 more
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Abstract Ion–molecule reactions (IMR) are at the very core of trace gas analyses in modern chemical ionization (CI) mass spectrometer instruments, which are increasingly being used in diverse areas of research and industry. The focus of this Perspective is on the ion chemistry that underpins gas-phase analytical CI methods.
David Smith +2 more
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Rapid Communications in Mass Spectrometry, 2019
Rationale Monitoring of isomeric analytes using mass spectrometry usually requires a time‐consuming chromatographic separation of the analytes before analysis. Selected ion flow tube mass spectrometry (SIFT‐MS) can provide rapid direct analysis of ethylbenzene and xylene by utilizing the ...
Caleb Allpress +6 more
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Rationale Monitoring of isomeric analytes using mass spectrometry usually requires a time‐consuming chromatographic separation of the analytes before analysis. Selected ion flow tube mass spectrometry (SIFT‐MS) can provide rapid direct analysis of ethylbenzene and xylene by utilizing the ...
Caleb Allpress +6 more
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Nature Protocols, 2021
The analysis of volatile organic compounds (VOCs) within breath for noninvasive disease detection and monitoring is an emergent research field that has the potential to reshape current clinical practice. However, adoption of breath testing has been limited by a lack of standardization.
Ilaria Belluomo +6 more
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The analysis of volatile organic compounds (VOCs) within breath for noninvasive disease detection and monitoring is an emergent research field that has the potential to reshape current clinical practice. However, adoption of breath testing has been limited by a lack of standardization.
Ilaria Belluomo +6 more
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Analytical Chemistry, 2005
A fast, efficient, real-time method for the quantitative analysis of the peroxide explosive, TATP, is described. The method utilizes rapid ion-molecule reactions of chemical reagent ions with the vapor above solid TATP. The reactions of three reagent ions (H3O+, O2+, NO+) were examined.
Paul F, Wilson +2 more
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A fast, efficient, real-time method for the quantitative analysis of the peroxide explosive, TATP, is described. The method utilizes rapid ion-molecule reactions of chemical reagent ions with the vapor above solid TATP. The reactions of three reagent ions (H3O+, O2+, NO+) were examined.
Paul F, Wilson +2 more
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On‐line analysis of diesel engine exhaust gases by selected ion flow tube mass spectrometry
Rapid Communications in Mass Spectrometry, 2004Abstract Selected ion flow tube mass spectrometry (SIFT‐MS) has been used to analyse on‐line and in real time the exhaust gas emissions from a Caterpillar 3304 diesel engine under different conditions of load (idle and 50% of rated load) and speed (910, 1500 and 2200 rpm) using three types of fuel: an ultra‐low ...
David, Smith +4 more
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