A5058724509- Pesticide and Herbicide Environmental Studies
- Analytical chemistry methods development
- Pharmaceutical and Antibiotic Environmental Impacts
- Isotope Analysis in Ecology
- Groundwater flow and contamination studies
- Radioactive contamination and transfer
- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Microbial bioremediation and biosurfactants
- Groundwater and Isotope Geochemistry
- Analytical Chemistry and Chromatography
- Mass Spectrometry Techniques and Applications
- Advanced oxidation water treatment
- Methane Hydrates and Related Phenomena
- Radioactivity and Radon Measurements
- Nuclear Physics and Applications
- Environmental remediation with nanomaterials
- Water Treatment and Disinfection
- Pesticide Residue Analysis and Safety
- Chemical Analysis and Environmental Impact
- CO2 Sequestration and Geologic Interactions
- Microbial Community Ecology and Physiology
- Geophysical Methods and Applications
- Oil Spill Detection and Mitigation
Université du Québec à Montréal
2023-2024
Grantmakers for Effective Organizations
2023
GGD Amsterdam
2022
University of Tübingen
2022
University of Neuchâtel
2015-2021
Agroscope
2017
Swiss Federal Institute of Aquatic Science and Technology
2017
Institute of Groundwater Ecology
2017
Helmholtz Zentrum München
2017
Technical University of Munich
2017
We validated a SPE-CSIA method that allows analysis of isotope ratios mixtures pesticides commonly occur together in environmental water samples.
Multielement isotope fractionation studies to assess pollutant transformation are well-established for point-source pollution but only emerging diffuse by micropollutants like pesticides. Specifically, chlorine is hardly explored promising, because many pesticides contain few atoms so that "undiluted" position-specific Cl effects can be expected in compound-average data. This study combined Cl, N, and C sensitively detect biotic abiotic of the widespread herbicides groundwater contaminants...
Atrazine is a frequently detected groundwater contaminant. Isotope ratio analysis of three elements (C, N, Cl) provide enhanced insight into its degradation pathways and hold promise for better source distinction in the field.
A gas chromatography-single quadrupole mass spectrometry method was developed and validated for compound-specific chlorine isotope analysis (Cl-CSIA) of three chlorinated herbicides, atrazine, acetochlor, metolachlor, which are widespread contaminants in the environment. For each compound, two most abundant ions containing (202/200 225/223 240/238 metolachlor) a dwell time 30 ms were determined as optimized MS parameters. limit precise ethyl acetate solutions 10 mg/L 5 metolachlor could be...
The widespread application of herbicides impacts surface water and groundwater. Metabolites (e.g., desphenylchloridazon from chloridazon) may be persistent even more polar than the parent herbicide, which increases risk groundwater contamination. When are still applied, metabolites constantly formed also degraded. Evaluating their degradation on basis concentration measurements is, therefore, difficult. This study presents compound-specific stable-isotope analysis (CSIA) nitrogen-...
Desphenylchloridazon (DPC), the main metabolite of herbicide chloridazon (CLZ), is more water soluble and persistent than CLZ frequently detected in bodies. When assessing DPC transformation environment, results can be nonconclusive if based on concentration analysis alone because estimates may confounded by simultaneous formation from CLZ. This study investigated fate combining concentration-based methods with compound-specific C N stable isotope (CSIA). Additionally, processes were...
Abandoned and flooded ore mines are examples of hostile environments (cold, dark, oligotrophic, trace metal) with a potential vast diversity microbial communities rarely characterized. This study aimed to understand the effects depth, source water (surface or groundwater), abiotic factors on present in old Forsyth iron mine Quebec (Canada). Water biofilm samples from were sampled by team technical divers who followed depth gradient (0 183 m deep) planktonic sessile communities’ structure. We...
Core Ideas Atrazine preferential flow shortly after application was governed by soil type. Injection of atrazine at depth enhanced flow. Uranine realistically illustrated the rapid and significant breakthrough. In reserve, bromide mimicked early breakthrough only with moraine soil. Using dye tracers as pesticide surrogates might assist in making sustainable decisions. The suitability two different to mimic behavior pesticides agricultural soils evidence potential for evaluated outdoor...
The suitability of two different tracers to mimic the behavior pesticides in agricultural soils and evidence potential for preferential flow was evaluated outdoor lysimeter experiments.The herbicide atrazine [6-chloro-N-ethyl-N¢-(1-methylethyl)-1,3,5-triazine-2,4-diamine] used as a model compound.Two were used: nonadsorbing tracer (bromide) weakly adsorbing dye (uranine).Two that are expected show extent macropore well-drained sandy-loamy Cambisol (gravel soil) poorly drained loamy (moraine...
Abstract Delivery of sulfate to petroleum hydrocarbons (PHCs) source zones and groundwater plumes is desirable enhance biodegradation rates when treatment has become limited due depletion sulfate. Sulfate land application involves spreading salts on ground surface allowing their dissolution infiltration into subsurface. The objectives this pilot‐scale investigation were capture the vertical transport beneath an area, confirm that reduction was occurring, explore how added affected benzene...
Lysimeter experiments were carried out to evaluate the applicability of compound-specific isotope analysis (CSIA) for assessing transport and fate selected herbicides in two agricultural soils cropped with corn. Monitoring target pesticides, metabolites tracers drainage water made apparent significant role preferential flow mobility studied compounds through soil vadose zone during first days after application. The detection confirmed degradation once higher residence times where achieved....
Many processes can contribute to the attenuation of frequently detected and toxic herbicides atrazine metolachlor in surface water, including photodegradation. Multi-element compound-specific isotope analysis has potential decipher between these different degradation pathways as Cl is a promising tool for both pathway identification sensitive indicator metolachlor. In this study, photodegradation experiments were conducted under simulated sunlight buffered solutions (direct photodegradation)...