A5022720978- Toxic Organic Pollutants Impact
- Environmental Toxicology and Ecotoxicology
- Per- and polyfluoroalkyl substances research
- Mercury impact and mitigation studies
- Isotope Analysis in Ecology
- Atmospheric chemistry and aerosols
- Effects and risks of endocrine disrupting chemicals
- Pharmaceutical and Antibiotic Environmental Impacts
- Microplastics and Plastic Pollution
- Microbial bioremediation and biosurfactants
- Oil Spill Detection and Mitigation
- Solid-state spectroscopy and crystallography
- Spectroscopy and Laser Applications
- Fish Ecology and Management Studies
- Heavy metals in environment
- Aquatic Ecosystems and Phytoplankton Dynamics
- High-pressure geophysics and materials
- Spectroscopy and Quantum Chemical Studies
- Analytical chemistry methods development
- Water Treatment and Disinfection
- Environmental Justice and Health Disparities
- Material Properties and Failure Mechanisms
- Advanced Chemical Physics Studies
- Wastewater Treatment and Reuse
- Photorefractive and Nonlinear Optics
Environment and Climate Change Canada
2011-2025
University of Windsor
2000-2019
University of Waterloo
2016
University of Toronto
1972-2014
Conestoga College
2013-2014
Ministry of the Environment, Conservation and Parks
2007-2011
Brock University
2007-2009
Fisheries and Oceans Canada
2008
Great Lakes Institute of Management
2000-2003
The extent of bioaccumulation and trophic transfer brominated diphenyl ether (BDE) congeners, hexabromocyclododecane (HBCD) diastereoisomers (alpha, beta, gamma), decabromodiphenylethane (DBDPE), bis(2,4,6-tribromophenoxy)ethane (BTBPE) was examined in a Lake Winnipeg (Canada) food web. Six species fish, zooplankton, mussels, sediment, water from the south basin lake were selected for study. Significant positive correlations found between concentrations total (sigma) polybrominated...
A number of initiatives have curtailed anthropogenic mercury emissions in North America over the last two decades; however, various factors, including long-range transport global emissions, may complicate response fish levels to remedial actions. Since Great Lakes are together largest surface freshwater body world and under influence many complicating trends from can reflect overall impact management actions at local, regional, perhaps scales. Here we present a comprehensive view Canadian...
The concentrations of per- and polyfluoroalkyl substances (PFAS) were determined in raw influent, final effluent, treated biosolids at Canadian wastewater treatment plants (WWTPs) to evaluate the fate PFAS through liquid solids trains typical process types used Canada assess time trends between 2009 2021. Data for 42 samples collected from 27 WWTP across current 48 WWTPs included analysis. Although regulated phased-out production by industry since early 2000s late 2000s/early2010s,...
Concentrations of non-polybrominated diphenyl ether (PBDE) brominated (hexabromocyclododecane [HBCD], 1,2-bis[2,4,6-tribromophenoxy]ethane [BTBPE], and pentabromoethylbenzene [PEB]) chlorinated (Dechlorane Plus [DP] as well short- medium-chain paraffins [SCCP MCCP, respectively]) flame retardants were evaluated in archived Lake Ontario, Canada, lake trout (Salvelinus namaycush) samples collected between 1979 2004. Polybrominated ethers also analyzed to provide a point reference for...
Biota and surface sediments collected from Lake Ontario were analyzed for polychlorinated naphthalenes (PCNs) non- mono-ortho-substituted biphenyls (n/ m-o-PCBs) to compare bioaccumulation behavior of these classes dioxin-like chemicals in a food web the Great Lakes. Mean sigmaPCN concentrations (tri-octaCN) ranged 14 +/- 9 pg/g plankton 3500 3200 (wet weight) lake trout while contained 21 38 ng/g (dry weight). Principal components analysis PCN congener patterns indicated that chlorine...
In Canada, perfluoroalkyl acids (PFAAs) have been the focus of several monitoring programs and research surveillance studies. Here, we integrate recent data perform a multi-media assessment to examine current status ongoing trends PFAAs in Canada. Concentrations perfluorooctane sulfonate (PFOS), perfluorooctanoate (PFOA), other long-chain perfluorocarboxylates (PFCAs) air, water, sediment, fish, birds across Canada are generally related urbanization, with elevated concentrations observed...
The concentrations of perfluoroalkyl acids (PFAAs) were determined in precipitation from three locations across the Great Lakes between 2006 and 2018 compared to those surface water. Perfluorooctane sulfonate (PFOS) perfluorooctanoate (PFOA) generally decreased precipitation, likely response phase-outs/regulatory actions. In comparison, shorter-chained PFAA, which are not regulated Canada did decrease perfluorohexanoate perfluorobutanoate (PFBA) recently increased, could be due their use as...
Application of treated sewage sludge (biosolids) from wastewater treatment plants (WWTPs) to farmlands is an important pathway through which microplastic particles (MPs) enter terrestrial ecosystems. Yet, concentrations in Canadian biosolids have only been estimated samples four WWTPs previously. We aimed fill this knowledge gap by quantifying microplastics 22 located nine provinces and two commercial fertilizer producers Canada. All had substantial ranging 228 1353 per gram dry weight...
Since the 1970s, several formal biomonitoring programs have been initiated to monitor temporal and spatial trends of persistent, bioaccumulative, (or) toxic chemicals (PBTs) in Great Lakes. Researchers used a variety approaches deal with common issues that arise these there is considerable debate literature as most appropriate methods use. Here, we critically review factors importance for dealing them under three main categories: organism-specific (lipid, age, size, sex, growth...
Single crystals of argon were grown and investigated at 82.3 K, near the triple point. X-ray diffraction photographs taken in transmission used to verify that single determine their orientation. Brillouin spectra obtained for several different orientations three crystals. The observed contained longitudinal component least one, sometimes both transverse components. Their frequency shifts adiabatic elastic constants K: ${C}_{11}=2.38\ifmmode\pm\else\textpm\fi{}0.04$,...
The concentrations of 135 pharmaceuticals and personal care products (PPCPs) were determined in raw influent, final effluent, treated biosolids at Canadian wastewater treatment plants (WWTPs) to evaluate the fate PPCPs through liquid solids trains typical types used Canada assess changes PPCP matrices between 2010-2013 2022. dominant influent effluent included antidiabetic metformin, analgesics/anti-inflammatories (acetaminophen, ibuprofen, 2-hydroxy-ibuprofen), caffeine its metabolite (1,7...
Abstract hedistributionpatternsofpolycyclicaromatichydrocarbons(PAH)andpolychlorinatedbiphenyls(PCBs) were determined in four benthic invertebrate species of western Lake Erie, USA, to assess and compare the processes governing exposure dynamics these two classes contaminants. Significant differences sum 17 PAH compounds observed among species, with mayflies containing highest body burden, followed by dreissenid mussels, amphipods, crayfish. For PCBs, contained significantly higher...
The A 2 Σ + –X Π emission spectrum of HF , between 3580 and 4830 Å, has been photographed at high resolution measurements on eight bands are reported. analysis yields rotational vibrational constants the X state for ν = 0 to 3. predissociation by rotation in is observed a dissociation energy 3203 ± 50 cm −1 above 0, N level this state. It shown that corresponds into H ( 1 S) F( P 1/2 ). detailed comparison with previous results obtained from photoelectron photoionization experiments recent...
Perfluoroalkyl contaminants (PFCs) were determined in Lake Ontario Trout sampled annually between 1997 and 2008 order to assess how current trends are responding recent regulatory bans voluntary phase-outs. We also combined our measurements with those of a previous study provide an updated assessment long-term trends. Concentrations PFCs generally increased from the late 1970s until mid-1980s mid-1990s, after which concentrations either remained unchanged (perfluorooctane sulfonate (PFOS)...
Background:The North American Great Lakes are home to > 140 types of fish and famous for recreational commercial fishing. However, the presence toxic substances has resulted in issuance consumption advisories that typically based on most restrictive contaminant.Objectives:We investigated whether these advisories, which neglect existence a mixture chemicals their possible additive adverse effects, adequately protective health humans consuming from Canadian waters Lakes.Methods:Using recent...
The concentrations of 30 pharmaceuticals and 17 hormones in influent, effluent, biosolid samples were determined at 19 representative Canadian wastewater treatment plants (WWTPs). Many are excreted by humans conjugated forms that not detected analytical techniques aimed free analytes. Conjugation can be reversed naturally occurring enzymes found WWTPs, the collection system, and/or environment. In this study, we applied deconjugating (β-glucuronidase/sulfatase) to an aliquot each sample...