Browsing Krogh, Erik by Title
Now showing items 1-20 of 21
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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] 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 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 ... -
[Pre-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 ... -
[Pre-print] Membrane introduction mass spectrometry (MIMS): A versatile tool for direct, real-time chemical measurements
(John Wiley & Sons, Inc., 2014-12)Membrane introduction mass spectrometry (MIMS) is a direct, continuous, online measurement technique. It utilizes a membrane to semi-selectively transfer analyte mixtures from a sample to a mass spectrometer, rejecting ... -
[Pre-print] Modeling analyte permeation in cylindrical hollow fiber membrane introduction mass spectrometry
(Elsevier, 2008-11-15)The time-resolved signal generated from membrane introduction mass spectrometry (MIMS) has been modeled in cylindrical coordinates to analyze the data from MIMS experiments, in which a capillary hollow fiber selectively ... -
[Pre-print] Paper spray mass spectrometry for the direct, semi-quantitative measurement of fentanyl and norfentanyl in complex matrices
(Elsevier, 2018)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 ... -
[Pre-print] Polymer inclusion membranes with condensed phase membrane introduction mass spectrometry (CP-MIMS): Improved analytical response time and sensitivity
(American Chemical Society, 2017-05-16)Condensed phase membrane introduction mass spectrometry (CP-MIMS) is an online, in situ analysis technique for low volatility analytes. Analytes diffuse through a hollow fibre membrane, where they are then dissolved by ... -
[Pre-print] The use of membrane introduction tandem mass spectrometry (MIMS-MS/MS) in field locations as an on-line quantitative environmental monitoring technique for trace contaminants in air and water
(Oxford University Press, 2009-01)Membrane introduction mass spectrometry (MIMS) is emerging as an important technique for on-line, real-time environmental monitoring. Because MIMS interfaces are simple and robust, they are ideally suited for operation in ...
