A5062120002- Heavy metals in environment
- Air Quality and Health Impacts
- Mercury impact and mitigation studies
- Radioactivity and Radon Measurements
- Heavy Metal Exposure and Toxicity
- Toxic Organic Pollutants Impact
- Nanoparticles: synthesis and applications
- Noise Effects and Management
- Analytical chemistry methods development
- Effects and risks of endocrine disrupting chemicals
- Air Quality Monitoring and Forecasting
- Geochemistry and Geologic Mapping
- Indoor Air Quality and Microbial Exposure
- Microplastics and Plastic Pollution
- Geochemistry and Elemental Analysis
- Traffic and Road Safety
- Legume Nitrogen Fixing Symbiosis
- Atmospheric chemistry and aerosols
- Smart Materials for Construction
- Electrochemical Analysis and Applications
- Pharmaceutical and Antibiotic Environmental Impacts
- Environmental Justice and Health Disparities
- Occupational and environmental lung diseases
- Recycling and Waste Management Techniques
- Animal Disease Management and Epidemiology
Health Canada
2015-2024
University of Ottawa
2015-2024
University of Copenhagen
2024
University of Zurich
2024
Lawrence Livermore National Laboratory
1981-2021
Samsø Energy Academy
2018
Natural Resources Canada
2006
University of Windsor
2006
Seattle University
2006
University of Guelph
2002
Diffuse anthropogenic and naturally mercury‐enriched areas represent long‐lived sources of elemental mercury to the atmosphere. The Nevada Study Tests Release Mercury From Soils (STORMS) project focused on measurement emissions from a enriched area. During project, concurrent measurements fluxes substrate were made September 1–4, 1997, using four micrometeorological methods seven field flux chambers. Ambient air concentrations ranged 2 nearly 200 ng m −3 indicating that site is source...
Solubility is a critical component of physicochemical characterisation engineered nanomaterials (ENMs) and an important parameter in their risk assessments. Standard testing methodologies are needed to estimate the dissolution behaviour biodurability (half-life) ENMs biological fluids. The effect pH, particle size crystal form on zinc metal, ZnO TiO2 was investigated using simple 2 h solubility assay at body temperature (37 °C) two pH conditions (1.5 7) approximately frame range found human...
Vacuum samples were collected from 1025 randomly selected urban Canadian homes to investigate bioaccessible Pb (PbS) concentrations in settled house dust. Results indicate a polymodal frequency distribution, consisting of three lognormally distributed subpopulations defined as "urban background" (geomean 58 μg g–1), "elevated" 447 and "anomalous" 1730 g–1). Dust PbS 924 (90%) fall into the category. The elevated anomalous predominantly consist older located central core areas cities....
ADVERTISEMENT RETURN TO ISSUEArticleNEXTCurrent Methods of Estimating Atmospheric Mercury Fluxes in Remote AreasPat E. RasmussenCite this: Environ. Sci. Technol. 1994, 28, 13, 2233–2241Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/es00062a006https://doi.org/10.1021/es00062a006research-articleACS PublicationsRequest reuse permissionsArticle Views422Altmetric-Citations119LEARN ABOUT THESE...
As part of an international Hg flux intercomparison at the Steamboat Springs, Nevada, geothermal area, several dynamic soil chambers and micrometeorological gradient systems were operated over desert soils in early September 1997. A series unanticipated convective rain cells impacted site with first rainfall ∼90 days, initial 4‐cm increased moisture from ∼0.01 to 0.06% (vol/vol). Several operating prior events, two deployed wet following rainfall. Rainfall resulted immediate steep rise...
Lead is neurotoxic at very low dose and there a need to better characterize the impact of domestic sources lead on biological exposure young children. A cross-sectional survey evaluated contribution drinking water, house dust paint blood levels (BLLs) children living in old boroughs Montréal (Canada). Three hundred six aged 1 5 years currently tap water participated study. For each participant, residential was measured kitchen floor dust, windowsill venous sample analyzed. Multivariate...
This study investigated relationships between element concentrations in settled indoor dust and airborne particulate matter (PM), characterized fine (PM2.5) coarse (PM10-2.5) modes of indoor, outdoor personal microenvironments. Concentrations house correlated significantly (99% CI) with PM10 for 11 out 17 studied elements: Ag, Al, As, B, Cu, Fe, Mn, Pb, U, V Zn. Five elements showed significant correlations dust, at 99% CI As; 95% Mn Sb. These dust- were observed non-smokers' homes Windsor,...
Phthalates have been used extensively as plasticizers to improve the flexibility of polymers, and they also found many industrial applications. They are ubiquitous in environment detected a variety environmental biological matrices. The goal this study was develop method for determination 17 phthalate esters house dust. This involved sonication extraction, sample cleanup using solid phase isotope dilution GC/MS/MS analysis. Method detection limits (MDLs) recoveries ranged from 0.04 2.93 μg/g...
Abstract Bioaccessibility is a measurement of substance's solubility in the human gastro-intestinal system, and often used risk assessment soils. The present study was designed to determine variability among laboratories using different methods measure bioaccessibility 24 inorganic contaminants one standardized soil sample, standard reference material NIST 2710. Fourteen total 17 extraction methods. between assessed by calculating reproducibility relative deviations (RSDs), where sum...
Road dust is a sink and source of metals metalloids human health concern. To date, many studies have examined the composition road but there remain critical knowledge gaps on chemistry thoracic fractions (< 10 μm) their patterns deposition resuspension. The goal this study to characterize elemental concentrations sources resuspension potential for Toronto, Ontario, Canada. Bulk sweepings were acid digested (HF, HClO4, HNO3 HCl) measured using ICP-MS. Principal component analysis (PCA) was...
ABSTRACT This study examines factors affecting oral bioaccessibility of metals in household dust, particular metal speciation, organic carbon content, and particle size, with the goal addressing risk assessment information requirements. Investigation copper (Cu) zinc (Zn) speciation two size fractions dust (< 36 μ m 80–150 m) using synchrotron X-ray absorption spectroscopy (XAS) indicates that are bound to different components dust: Cu is predominately associated phase while Zn mineral...
Physical chemical characterization of nanomaterials is critical to assessing quality control during production, evaluating the impact material properties on human health and environment, developing regulatory frameworks for their use. We have investigated a set 29 from four metal oxide families (aluminum, copper, titanium zinc) with focus measurands that are important basic dry determination dose metrics nanotoxicology. These include crystalline phase crystallite size, measured by powder...
Ethiopia's cattle population is among the largest in Africa and burdened by frequent foot-and-mouth disease (FMD) outbreaks. FMD caused several distinct highly contagious viral strains that can result acute cattle, causing losses productivity impeding international trade. This economic simulation study considered four main sources of due to cattle: reduced milk yield, draft power fertility, increased mortality. Economic were estimated per case across age-sex strata 89 Ethiopian...
Field measurements of mercury air‐surface exchange from natural settings were made in various Canadian landscapes. Soil and water samples analyzed for concentrations, fluxes these substrates determined using dynamic chamber, micrometeorological, or modeling methods. Environmental variables, including air soil/water temperature, solar radiation, humidity, wind speed, monitored concurrently with the to better understand processes affecting environmental cycling mercury. Average aquatic...