Browsing Krogh, Erik by Title
Now showing items 1-20 of 34
-
Characterizing photochemical ageing processes of microplastic materials using multivariate analysis of infrared spectra
(Royal Society of Chemistry, 2022-01-01)Microplastics in the environment are an emerging concern due to impacts on human and environmental health. In addition to direct effects on biota, microplastics influence the fate and distribution of trace organic contaminants ... -
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 analysis of polyaromatic hydrocarbons in soil and aqueous samples using condensed phase membrane introduction tandem mass spectrometry with low energy liquid electron ionization
(American Chemical Society, 2018-12-18)Polyaromatic hydrocarbons (PAHs) are listed as priority pollutants by the US EPA. PAH contaminated samples often require extensive sample cleanup before analysis, with the method used dependent upon the sample matrix. ... -
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 direct mass spectrometry method for the rapid analysis of a ubiquitous tire derived toxin N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine quinone (6-PPDQ)
(ACS Publications, 2021-10-20)The oxidative transformation product of a common tire preservative, identified as N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine quinone (6-PPDQ), has recently been found to contribute to ‘urban run-off mortality ... -
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. ... -
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 ... -
Direct, isomer-specific quantitation of polycyclic aromatic hydrocarbons in soils using membrane introduction mass spectrometry and chemical ionization
(American Chemical Society, 2020-12-01)Polycyclic aromatic hydrocarbons (PAHs) are routinely screened for in soils, where quantitation of structural isomers is critical due to varying toxicity within PAH isomer classes. While chromatographic methods provide ... -
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 ... -
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 ... -
Geospatial assessment of trace-level benzophenone-3 in a fish-bearing river using direct mass spectrometry
(ACS Publications, 2022-02-11)Benzophenone-3 (2-hydroxy-4-methoxybenzophenone) is present in many sunscreens/cosmetics due to its UV-filtering properties, and has consequently been observed in recreational waters. There are growing concerns about ... -
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 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 ... -
Online membrane sampling for the mass spectrometric analysis of oil sands process affected water-derived naphthenic acids in real-world samples
(MDPI, 2023-04)Large volumes of oil sands process-affected waters (OSPW) result from heavy oil extraction in Alberta, Canada. Currently, a toxic legacy of ca. 500 Mm3 is stored in tailings ponds under a zero-discharge policy. OSPW is ... -
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 ... -
[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 ...
