Roving GC/MS: Mapping VOC gradients and trends in space and time

McClennen, William H.; Vaughn, Chris L.; Cole, Paul; Sheya, SueAnne N.; Wager, David J.; Mott, T. J.; Dworzański, Jacek P.; Arnold, Neil; Meuzelaar, Henk L. C.

doi:10.1002/(sici)1520-6521(1996)1:2<109::aid-fact8>3.0.co;2-u

Cited by 28 publications

(13 citation statements)

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“…The analytical performance of the portable mass spectrometer with a direct inlet membrane (DIM) probe combined was carried out using a static dilution procedure [60, 61]. Liquid stock solutions of 10 mL screw vials (Agilent Technologies LDA UK Ltd) of model standards were prepared in methanol at varying concentrations (250, 500, 1000, and 5000 and 10000 ppb).…”

Section: Methodsmentioning

confidence: 99%

In-Situ Analysis of Essential Fragrant Oils Using a Portable Mass Spectrometer

Jjunju

Giannoukos

Marshall

et al. 2019

International Journal of Analytical Chemistry

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A portable mass spectrometer was coupled to a direct inlet membrane (DIM) probe and applied to the direct analysis of active fragrant compounds (3-methylbutyl acetate, 2-methyl-3-furanthiol, methyl butanoate, and ethyl methyl sulfide) in real time. These fragrant active compounds are commonly used in the formulation of flavours and fragrances. Results obtained show that the portable mass spectrometer with a direct membrane inlet can be used to detect traces of the active fragrant compounds in complex mixtures such as essential fragrant oils and this represents a novel in-situ analysis methodology. Limits of detection (LOD) in the sub-ppb range (< 2.5 pg) are demonstrated. Standard samples in the gaseous phase presented very good linearity with RSD % at 5 to 7 for the selected active fragrant compounds (i.e., isoamyl acetate, 2-methyl-3-furanthiol, methyl butanoate, and methyl ethyl sulphide). The rise and fall times of the DIM probe are in the ranges from 15 to 31 seconds and 23 to 41 seconds, respectively, for the standard model compounds analysed. The identities of the fragrance active compounds in essential oil samples (i.e., banana, tangerine, papaya, and blueberry muffin) were first identified by comparison with a standard fragrance compounds mixture using their major fragment peaks, the NIST standard reference library, and gas chromatography mass spectrometry (GC-MS) analysis. No sample preparation is required for analysis using a portable mass spectrometer coupled to a DIM probe, so the cycle time from ambient air sampling to the acquisition of the results is at least 65 seconds.

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Section: Methodsmentioning

confidence: 99%

In-Situ Analysis of Essential Fragrant Oils Using a Portable Mass Spectrometer

Jjunju

Giannoukos

Marshall

et al. 2019

International Journal of Analytical Chemistry

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“…To generate gas standards, we used the technique of the static dilution bottles. Details can be found in the literature [51,52]. Appropriate quantities of the liquid stock solution were injected in clean 1.2 L glass flasks (Sigma Aldrich Co.…”

Section: Experimental Procedurementioning

confidence: 99%

Direct analysis and monitoring of organosulphur compounds in the gaseous phase using portable mass spectrometry

2019

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“…GC-IMS peaks were identified using the retention time and drift time of vapor standards in hexane. The vapor calibration standards were prepared as described in the literature [25].…”

Section: Gc-ims Determinationmentioning

confidence: 99%