Post Doctoral Fellow, University of Toronto/Ontario Ministry of the Environment and Climate Change/Conservation Ontario, Canada (2015-16)
I developed a QuEChERS screening method to quickly identify potential contaminants of concern in sediments. Extracted samples were analysed using atmospheric pressure gas chromatography and high resolution time of flight mass spectrometry (APGC-HRToFMS).
Post Doctoral Fellow, Ryerson University/Ontario Ministry of the Environment and Climate Change, Canada (2014-15)
I developed an analytical method for the analysis of emerging organophosphorous and halogenated flame retardants using APGC-HRToFMS
Independent consultant, (2008-16)
I operated as an independent consultant in environmental forensics. I was appointed to an expert panel to identify the risks to surface waters from hydraulic fracturing, provided assistance on legal cases with data interpretation and analysis to establish the source of a PCBs. I have also run a series of workshops and given lectures on contaminated land assessment and environmental forensics.
Environmental Scientist, Mouchel, UK (2007-11)
I was a technical advisor for human health risk assessment and environmental forensics associated with contaminated land. I conducted a large variety of different projects assessing contamination and human exposure on a former gas works, a chemical factory, several former landfills, residential, industrial, allotments, public open space and highway schemes
My main research interests are in the field of environmental forensics. This involves the systematic and scientific evaluation of physical, chemical and historical information for the purpose of developing defensible scientific and legal conclusions regarding the source or age of a contaminant release into the environment." Or in more basic English; establishing the "who", "what", "when" and "where" from a contamination event.
My specific research areas are:
G. O'Sullivan, D. Megson (2015). Environmental Forensics Proceedings of the 2014 INEF Conference. Royal Society of Chemistry.
R. Lega, D. Megson, C. Hartley, P. Crozier, K. MacPherson, et al. (2017). Congener specific determination of polychlorinated naphthalenes in sediment and biota by gas chromatography high resolution mass spectrometry. Journal of Chromatography A. 1479, pp.169-176.
D. Megson, M. Robson, KJ. Jobst, PA. Helm, EJ. Reiner (2016). Determination of Halogenated Flame Retardants Using Gas Chromatography with Atmospheric Pressure Chemical Ionization (APCI) and a High-Resolution Quadrupole Time-of-Flight Mass Spectrometer (HRqTOFMS). Analytical Chemistry. 88(23), pp.11406-11411.
R. Guo, D. Megson, AL. Myers, PA. Helm, C. Marvin, et al. (2016). Application of a comprehensive extraction technique for the determination of poly- and perfluoroalkyl substances (PFASs) in Great Lakes Region sediments. Chemosphere. 164, pp.535-546.
D. Megson, EJ. Reiner, KJ. Jobst, FL. Dorman, M. Robson, et al. (2016). A review of the determination of persistent organic pollutants for environmental forensics investigations. Analytica Chimica Acta. 941, pp.10-25.
D. Megson, X. Ortiz, KJ. Jobst, EJ. Reiner, MFA. Mulder, et al. (2016). A comparison of fresh and used aircraft oil for the identification of toxic substances linked to aerotoxic syndrome. Chemosphere. 158, pp.116-123.
DP. Megson (2016). Environmental Forensics in the Workplace. LCGC North America. 34(8), pp.564-565.
D. Megson, JF. Focant, DG. Patterson, M. Robson, MC. Lohan, et al. (2015). Can polychlorinated biphenyl (PCB) signatures and enantiomer fractions be used for source identification and to age date occupational exposure?. Environment International. 81, pp.56-63.
DP. Megson, JC. Balouet, F. Gallion, G. O'Sullivan (2015). FORENSIC INVESTIGATIONS IN COMPLEX POLLUTION CASES INVOLVING PCBS, DIOXINS AND FURANS: POTENTIAL PITFALLS AND TIPS.
DP. Megson, G. O'Sullivan, PJ. Worsfold, MC. Lohan, S. Comber (2014). Techniques to Age Date Human Exposure to PCBs.
D. Megson, TA. Brown, GW. Johnson, G. O'Sullivan, AWJ. Bicknell, et al. (2014). Identifying the provenance of Leach's storm petrels in the North Atlantic using polychlorinated biphenyl signatures derived from comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry. Chemosphere. 114, pp.195-202.
D. Megson, R. Kalin, PJ. Worsfold, C. Gauchotte-Lindsay, DG. Patterson, et al. (2013). Fingerprinting polychlorinated biphenyls in environmental samples using comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry. Journal of Chromatography A. 1318, pp.276-283.
D. Megson, G. O'Sullivan, S. Comber, PJ. Worsfold, MC. Lohan, et al. (2013). Elucidating the structural properties that influence the persistence of PCBs in humans using the National Health and Nutrition Examination Survey (NHANES) dataset. Science of the Total Environment. 461-462, pp.99-107.
DP. Megson, S. Dack (2012). Assessing changes to the congener profile of PCDD and PCDF during bioaccumulation in chicken and duck eggs.
D. Megson, S. Dack, M. Moore (2011). Limitations of the CLEA model when assessing human health risks from dioxins and furans in soil at an allotments site in Rochdale, NW England. Journal of Environmental Monitoring. 13(7), pp.1983-1990.
D. Wayland, DP. Megson, SM. Mudge, JD. Icely, A. Newton (2008). Identifying the source of nutrient contamination in a lagoon system. Environmental Forensics. 9(2-3), pp.231-239.
V. Jaspers, D. Megson, G. O'Sullivan (2013). POPs in the Terrestrial Environment. In: Environmental Forensics for Persistent Organic Pollutants. pp.291-356.
EJ. Reiner, KJ. Jobst, D. Megson, FL. Dorman, JF. Focant (2013). Analytical Methodology of POPs. In: Environmental Forensics for Persistent Organic Pollutants. pp.59-139.
G. O'Sullivan, D. Megson (2013). Brief Overview: Discovery, Regulation, Properties, and Fate of POPs. In: Environmental Forensics for Persistent Organic Pollutants. pp.1-20.
Megson, D., Reiner, EJ., Jobst, KJ., Dorman, FL., Robson, M., Focant, JF., A review of the determination of persistent organic pollutants for environmental forensics investigations. Analytica Chimica Acta, (in Press) http://dx.doi.org/10.1016/j.aca.2016.08.027
I regularly review articles for environmental journals including:
I am currently a guest editor for Emerging Contaminants and the Journal of Environmental Pollution
I am also the editor for the International Network of Environmental Forensics Bulletin