A5040682893- Pharmaceutical and Antibiotic Environmental Impacts
- Environmental Toxicology and Ecotoxicology
- Toxic Organic Pollutants Impact
- Analytical chemistry methods development
- SARS-CoV-2 detection and testing
- Gut microbiota and health
- Microplastics and Plastic Pollution
- Environmental DNA in Biodiversity Studies
- Constructed Wetlands for Wastewater Treatment
- Pesticide and Herbicide Environmental Studies
- Biosensors and Analytical Detection
- Per- and polyfluoroalkyl substances research
- Metabolomics and Mass Spectrometry Studies
- Advanced biosensing and bioanalysis techniques
- Microbial Community Ecology and Physiology
- Water Treatment and Disinfection
- Aquaculture disease management and microbiota
- Smart Materials for Construction
- Advanced Chemical Sensor Technologies
- Antibiotics Pharmacokinetics and Efficacy
- Advanced oxidation water treatment
- Wastewater Treatment and Reuse
- Groundwater flow and contamination studies
- Chemistry and Chemical Engineering
- Pesticide Residue Analysis and Safety
Agriculture and Agri-Food Canada
2022-2025
University of Saskatchewan
2020-2024
Lethbridge Research and Development Centre
2024
University of Manitoba
2013-2020
University of Winnipeg
2012-2020
N-(1,3-Dimethylbutyl)-N′-phenyl-p-phenylenediamine-quinone (6PPD-quinone), a transformation product of the rubber tire antioxidant 6PPD, has recently been identified as chemical responsible for urban runoff mortality syndrome in coho salmon, with median lethal concentration (LC50) <0.1 μg/L. Subsequent studies have failed to confirm comparable sensitivity other fish species. Here, we investigated acute toxicity 6PPD-quinone rainbow trout, brook Arctic char, and white sturgeon. Fish were...
Recent findings that 2-anilo-5-[(4-methylpentan-2-yl)amino]cyclohexa-2,5-diene-1,4-dione (6PPD-quinone), the transformation product of a common tire rubber antioxidant, is acutely toxic in stormwater-impacted streams has highlighted need for better understanding contaminants urban runoff. This study represents one first reports 6PPD-quinone and other rubber-derived compounds stormwater snowmelt cold-climate Canadian city (Saskatoon, 2019–2020). Semiquantification five target compounds,...
N-(1,3-Dimethylbutyl)-N′-phenyl-p-phenylenediamine-quinone (6PPD-quinone), a rubber tire oxidation product found in road runoff, is highly and acutely toxic to selected salmonids including coho salmon, brook trout, rainbow trout but not other fish species invertebrates studied date. Sensitive displayed increased ventilation gasping, suggesting possible impact on respiration. Here, adherent cell lines RTL-W1 RTgill-W1 were exposed 5–80 μg/L 6PPD-quinone, cytotoxicity, oxygen consumption rate...
A unique configuration of the diffusive gradients in thin films sampler for polar organics (o-DGT) without a poly(ether sulfone) membrane was developed, calibrated, and field-evaluated. Diffusion coefficients (D) through agarose gels ranged from (1.02 to 4.74) × 10–6 cm2/s 34 pharmaceuticals pesticides at 5, 13, 23 °C. Analyte-specific diffusion–temperature plots produced linear (r2 > 0.85) empirical relationships whereby D could be estimated any environmentally relevant temperature (i.e.,...
Environmental fate processes of neonicotinoid insecticides are significant interest, given the serious threats these chemicals can pose to nontarget organisms such as pollinators (e.g., bees). Direct photolysis was investigated using a laboratory photoreactor approximating full-spectrum sunlight predict aquatic neonicotinoids. Quantum yields (ϕc) were 0.019 ± 0.001, 0.013 0.0092 0.0005, 0.0022 0.0003, and 0.0013 0.0002 for thiamethoxam, clothianidin, imidacloprid, acetamiprid, thiacloprid,...
Non-targeted analysis (NTA) encompasses a rapidly evolving set of mass spectrometry techniques aimed at characterizing the chemical composition complex samples, identifying unknown compounds, and/or classifying without prior knowledge regarding content samples. Recent advances in NTA are result improved and more accessible instrumentation for data generation tools evaluation interpretation. As researchers continue to develop approaches various scientific fields, there is growing need...
Abstract Background The discharge of complex mixtures nutrients, organic micropollutants, and antibiotic resistance genes from treated municipal wastewater into freshwater systems are global concerns for human health aquatic organisms. Antibiotic (ARGs) that have the ability to impart antibiotics reduce efficacy in which they found. In rural community Grand Marais, Manitoba, Canada, is passively a sewage lagoon prior passage through treatment wetland subsequent release surface waters. Using...
The organic-diffusive gradients in thin-films (o-DGT) technique has emerged as a promising aquatic passive sampler that addresses many of the challenges associated with current sampling tools used for measurement polar organic contaminants. This study represents first comprehensive field evaluation o-DGT natural surface waters, across wide suite pharmaceuticals and pesticides. We explore utility limitations quantitative tool compared to grab chemical integrative (POCIS) four connected...
Effective removal of organic contaminants in wastewater effluent poses a challenge to small communities worldwide, particularly the Arctic due infrastructure challenges and harsh climates. To understand better efficacy current treatment options risks posed by pharmaceuticals pesticides on receiving waters Arctic, four representative human Nunavut, Canada were evaluated. Per- polyfluorinated alkyl substances (PFASs) also investigated one community. These have ranging from primary lagoons,...
There are no standardized protocols for quantifying severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in wastewater to date, especially population normalization. Here, a pipeline was developed, applied, and assessed quantify SARS-CoV-2 key variants of concern (VOCs) RNA at Saskatoon, Canada. Normalization approaches using recovery ratio extraction efficiency, parameters, or indicators were by comparing daily numbers new cases. Viral load positively correlated with cases reported...
The stability of 24 chemicals, including pharmaceuticals and personal care products, some agrochemicals on extraction media was evaluated by preloading them onto Oasis hydrophilic lipophilic balanced solid-phase (SPE) cartridges polar organic chemical integrative samplers (POCIS) followed storage at -20°C over time. After 20 months, the average loss 11% POCIS, with only 2,4-dichlorophenoxyacetic acid, atrazine, chlorpyrifos, gemfibrozil showing a statistically significant decline compared...