
Violaine PonsinUniversity of Quebec in Montreal | UQAM
Violaine Ponsin
PhD
About
25
Publications
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Introduction
Additional affiliations
July 2019 - present
July 2019 - present
January 2019 - June 2019
Publications
Publications (25)
Abandoned and flooded ore mines are examples of hostile environments (cold, dark, oligotrophic, trace metal) with a potential vast diversity of microbial communities rarely characterized. This study aimed to understand the effects of depth, the source of water (surface or groundwater), and abiotic factors on the communities present in the old Forsy...
Delivery of sulfate to petroleum hydrocarbons (PHCs) source zones and groundwater plumes is desirable to enhance biodegradation rates when treatment has become limited due to depletion of sulfate. Sulfate land application involves spreading sulfate salts on ground surface and allowing their dissolution and infiltration of sulfate into subsurface. T...
Desphenylchloridazon (DPC), the main metabolite of the herbicide chloridazon (CLZ), is more water soluble and persistent than CLZ and frequently detected in water bodies. When assessing DPC transformation in the environment, results can be non-conclusive if based on concentration analysis alone, because estimates may be confounded by simultaneous D...
Atrazine is a frequently detected groundwater contaminant. It can be microbially degraded by oxidative dealkylation or by hydrolytic dechlorination. Compound-specific isotope analysis is a powerful tool to assess its transformation. In previous work, carbon and nitrogen isotope effects were found to reflect these different transformation pathways....
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 and metolachlor, which are widespread contami-nants in the environment. For each compound, the two most abundant ions containing chlorine (202/200...
Compound-specific isotope analysis (CSIA) is a valuable tool for assessing the fate of organic pollutants in the environment. However, the requirement of sufficient analyte mass for precise isotope ratio mass spectrometry combined with prevailing low environmental concentrations currently limits comprehensive applications to many micropollutants. H...
Widespread application of herbicides impacts surface water and groundwater. Their metabolites (e.g., desphenylchloridzon from chloridazon) may be persistent and even more polar than the parent herbicide, which increases the risk of groundwater contamination. When parent herbicides are still applied, metabolites are constantly formed and may in addi...
The suitability of two different tracers to mimic the behavior of pesticides in agricultural soils and to evidence the potential for preferential flow was evaluated in outdoor lysimeter experiments. The herbicide atrazine was used as a model compound. Two tracers were used: a nonadsorbing tracer (bromide) and a weakly adsorbing dye tracer (uranine)...
Core Ideas
Atrazine preferential flow shortly after application was governed by soil type.
Injection of atrazine at depth enhanced preferential flow.
Uranine realistically illustrated the rapid and significant atrazine breakthrough.
In reserve, bromide mimicked early atrazine breakthrough only with moraine soil.
Using dye tracers as pesticide surro...
For evaluating pesticide/metabolite transformation under complex environmental conditions new compound-specific isotope analysis (CSIA) methods were developed and tested in lysimeter experiments. Selected herbicides and metabolites commonly detected in groundwater were applied either at the surface or through artificially created preferential flow...
A lysimeter facility was used to study long-term pesticide fate and transport through two different soils. The present investigation focuses on some commonly and worldwide used herbicides for weed control on corn (atrazine, acetochlor and metolachlor) and sugar beet (chloridazon), together with their main degradation products. Since some degradatio...
Compound-specific isotope analysis (CSIA) is increasingly used to evaluate the origin and fate of petroleum hydrocarbons in the environment. However, as samples often contain a complex mixture of compounds and the method requires a full chromatographic separation, it can be challenging to obtain accurate and precise isotope values. In this study, i...
Lysimeter experiments were carried out to evaluate the applicability of compound-specific isotope analysis (CSIA) for assessing transport and fate of selected herbicides in two agricultural soils cropped with corn. Monitoring of target pesticides, metabolites and tracers in drainage water made apparent the significant role of preferential flow in t...
The objective of this study was to investigate whether 222Rn in groundwater can be used as a tracer for light non-aqueous phase liquid (LNAPL) quantification at a field site treated by dual-phase LNAPL removal. After the break of a pipeline, 5 ha of soil in the nature reserve Coussouls de Crau in southern France was contaminated by 5100 m3 of crude...
After a crude oil spill caused by a broken pipeline in 2009 to a gravel aquifer in southern France, degradation processes under various redox conditions progressively established, but at rates that predict a long life-time of the source under natural attenuation after partial source removal. In this study, we aimed at identifying the rate-limiting...
The rupture of a pipeline in the La Crau plain on August 7th 2009 was an accident unique in Europe by the volumes spilled and by its location at the heart of a nature resen,e. Two years after this event, it appears appropriate to present an initial experience feedback on this accident that was one of the triggering events in the changes to the indu...