Browsing Gill, Chris by Title
Now showing items 1-20 of 28
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Analysis of surfaces, films, and multilayers by resonant laser ablation
(SPIE, 1995)In this manuscript we review briefly the history of Resonant Laser Ablation (RLA), and discuss some current ideas regarding sample preparation, laser parameters, and mechanism. We also discuss current applications including ... -
Application of weakly ionized plasmas for materials sampling and analysis
(IEEE, 1991-12)The use of weakly ionized plasmas as spectroscopic sources for materials sampling and analysis is reviewed. Plasma sources currently used for this purpose include direct-current and alternating-current plasmas, inductively ... -
Condensed phase membrane introduction mass spectrometry with in situ liquid reagent chemical ionization in a liquid electron ionization source (CP-MIMS-LEI/CI)
(American Chemical Society, 2020-03-02)Direct mass spectrometry has grown significantly due to wide applicability, relative ease of use, and high sample throughput. However, many current direct mass spectrometry methods are largely based on ambient ionization ... -
Direct mass spectrometric analysis of naphthenic acids and polycyclic aromatic hydrocarbons in waters impacted by diluted bitumen and conventional crude oil
(Elsevier, 2021-04-15)The accidental release of hydrocarbons has well-documented, deleterious impacts on the hydrosphere. There are several classes of toxic petroleum derived compounds, such as naphthenic acids (NAs) and polycyclic aromatic ... -
A field portable membrane introduction mass spectrometer with in-line standard infusion and sample heat exchanger for real-time monitoring of volatile organic compounds in aqueous samples
(Elsevier on behalf of KeAi Communications, 2020-09-22)Maintaining a steady sample temperature when analyzing real-time samples in the field is crucial for Membrane Introduction Mass Spectrometry (MIMS). Diffusion through the membrane interface is temperature dependent, and ... -
[Post-print] 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 ... -
[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 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 and geo-spatial mapping of atmospheric VOC sources using full scan direct mass spectral data collected from a moving vehicle
(Royal Society of Chemistry, 2020-01)Volatile and semi-volatile organic compounds (S/VOCs) are ubiquitous in the environment, come from a wide variety of anthropogenic and biogenic sources, and are important determinants of environmental and human health due ... -
[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 ... -
[Pre-print] A novel thermally assisted membrane introduction mass spectrometry (MIMS) interface for the rapid and sensitive on-line measurement of volatile and semi-volatile organic contaminants in air and water at parts-per trillion level
(John Wiley & Sons, Inc., 2006-07-15)A coaxially heated membrane introduction mass spectrometry (MIMS) sampling interface is presented that demonstrates improved on-line performance for the direct measurement of semi-volatile organic compounds (SVOCs) in air ...
