Browsing Gill, Chris by Title
Now showing items 11-30 of 41
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Mapping the geospatial distribution of atmospheric BTEX compounds using portable mass spectrometry and adaptive whole air sampling
(Electronic version published by Vancouver Island University, 2020-03)Atmospheric environmental monitoring with mobile laboratories is becoming more common as instrumentation evolves and the benefits of taking the lab-to-sample are realized. One of the benefits of this approach is the ... -
Measurement of diacetyl and related compounds in coffee roasteries and breweries
(Oxford University Press, 2022-06)α-Diketones such as diacetyl (2,3-butanedione) and 2,3-pentanedione are generated during the roasting and fermentation of foods and are also used as flavoring compounds. Exposure to these compounds has been associated with ... -
Membrane sampling separates naphthenic acids from biogenic dissolved organic matter for direct analysis by mass spectrometry
(ACS Publications, 2022-03-01)Oil sands process waters can release toxic naphthenic acids (NAs) into aquatic environments. Analytical techniques for NAs are challenged by sample complexity and interference from naturally occurring dissolved organic ... -
A new mass spectrometry based approach for organic synthesis monitoring
(American Chemical Society, 2019-08-12)Current mass spectrometry-based methodologies for synthetic organic reaction monitoring largely use electrospray ionization (ESI), or other related atmospheric pressure ionization-based approaches. Monitoring of ... -
A new quantitative drug checking technology for harm reduction: Pilot study in Vancouver, Canada using paper spray mass spectrometry
(John Wiley & Sons, Inc., 2021-08-04)Introduction. Drug checking services for harm reduction and overdose prevention have been implemented in many jurisdictions as a public health intervention in response to the opioid overdose crisis. This study demonstrates ... -
A passive membrane system for on-line mass spectrometry reagent addition
(John Wiley & Sons, Inc., 2023-04-30)Rationale: Post-separation addition of chemical modifiers in liquid chromatography–mass spectrometry is widely used for improving ionization sensitivity and selectivity. This is typically accomplished using a post-column ... -
Portable gas chromatography-mass spectrometry in drug checking: Detection of carfentanil and etizolam in expected opioid samples
(Elsevier, 2021-11)Background: There has been a recent increase in adulteration of opioids with low concentration actives such as fentanyl analogues and benzodiazepines. As drug checking projects using vibrational spectroscopy continue to ... -
[Post-print] A semi-quantitative approach for the rapid screening and mass profiling of naphthenic acids directly in contaminated aqueous samples
(John Wiley & Sons, Inc., 2016-01)We report the use of a direct sampling, online analytical approach for the determination of acid extractable naphthenic acids in complex aqueous samples, known as condensed phasemembrane introductionmass spectrometry ... -
[Post-print] Direct analysis of naphthenic acids in constructed wetland samples by condensed phase membrane introduction mass spectrometry
(Elsevier, 2020-05-10)The application of direct mass spectrometry techniques to the analysis of complex samples has a number of advantages including reduced sample handling, higher sample throughput, in situ process monitoring, and the potential ... -
[Post-print] Direct measurement of acid dissociation constants of trace organic compounds at nanmolar levels in aqueous solution by condensed phase membrane introduction mass spectrometry
(John Wiley & Sons, Inc., 2019-06-18)We report the use of condensed phase membrane introduction mass spectrometry as a novel method for the determination of acid dissociation constants for hydrophobic organic acids in aqueous solution at nanomolar concentrations. ... -
[Post-print] Direct quantitation and characterization of fatty acids in salmon tissue by condensed phase membrane introduction mass spectrometry (CP-MIMS) using a modified donor phase
(Springer Nature, 2019-01)Existing mass spectrometric methods for the analysis of fatty acids often require derivatization, chromatographic separations and/or extensive sample preparation. Direct mass spectrometry strategies can avoid these ... -
[Post-print] Discrimination of constructed air samples using multivariate analysis of full scan membrane introduction mass spectrometry (MIMS) data
(John Wiley & Sons, Inc., 2018-02-28)RATIONALE: Volatile and semi-volatile organic compounds (S/VOCs) are important atmospheric pollutants affecting both human and environmental health. They are directly measured as an unresolved mixture using membrane ... -
[Post-print] New pH-dependent photosubstitution pathways of syringic acid in aqueous solution: Relevance in environmental photochemistry
(Elsevier, 2009-09-25)The aqueous photochemistry of 4-hydroxy-3,5-dimethoxybenzoic acid (syringic acid) (1) and related compounds has been studied to investigate the novel pH-dependent photosubstitution pathways exhibited upon photolysis. ... -
[Post-print] On-line measurement of oxidative degradation kinetics for trace gasoline contaminants in aqueous solutions and natural water by membrane introduction tandem mass spectrometry
(Taylor & Francis Group, 2010-09-29)Membrane introduction mass spectrometry (MIMS) was used to directly monitor the loss of trace gasoline contaminants (benzene, toluene, 2-methylthiophene and methylcyclohexane) in nanomolar (ppb) aqueous solutions under a ... -
[Post-print] Online measurement of phthalate-particulate matter interactions by membrane introduction mass spectrometry (MIMS)
(Taylor & Francis Group, 2018-02-23)To enable further study and assessment of indoor inhalation exposure risk, an online apparatus enabling measurement of semi-volatile compound partitioning on household particulates was developed. An example method for ... -
[Post-print] Paper spray mass spectrometry for the direct, semi-quantitative measurement of fentanyl and norfentanyl in complex matrices
(Elsevier, 2018-04)Background: Fentanyl is a potent, synthetic opioid at the centre of an international health crisis that has seen thousands of fatal overdoses. Most analytical methods focus on the detection of fentanyl in blood and/or ... -
[Post-print] Paper spray mass spectrometry: A new drug checking tool for harm reduction in the opioid overdoes crisis
(John Wiley & Sons, Inc., 2019-08-20)Fentanyl and related psychoactive substances are at the forefront of the opioid overdose crisis, for which a complete solution is not immediately obvious. Drug testing for harm reduction may be an effective approach to ... -
[Post-print] Photosensitized degradation kinetics of trace halogenated contaminants in natural waters using membrane introduction mass spectrometry as an in-situ reaction monitor
(Royal Society of Chemistry, 2015-11)The photochemically mediated dechlorination of polyhalogenated compounds represents a potential decontamination strategy and a relevant environmental process in chemically reducing media. We report the UV irradiation of ... -
[Post-print] Rapid analysis of fentanyls and other novel psychoactive substances (NPS) in substance use disorder patient urine using paper spray mass spectrometry
(John Wiley & Sons, Inc., 2018-08-15)RATIONALE: Drug overdose deaths due to fentanyls and other novel psychoactive substances (NPS) are on the rise. The higher potencies of fentanyl analogs compared with morphine require new technologies to identify and ... -
[Post-print] Rapid screening of carboxylic acids from waste and surface waters by ESI-MS/MS using barium ion chemistry and on-line membrane sampling
(Springer, 2016-03)Negative ion tandem mass spectrometric analysis of aliphatic carboxylic acids often yields only non-diagnostic ([M-H]-) ions with limited selective fragmentation. However, carboxylates cationized with Ba2+ have ...
