The role of ponds in pesticide dissipation at the catchment scale: The case of the Save agricultural catchment (Southwestern France)

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 934, P. 173131 - 173131

Published: May 9, 2024

Language: Английский

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Tracking atrazine degradation in soil combining 14C-mineralisation assays and compound-specific isotope analysis

Chemosphere, Journal Year: 2024, Volume and Issue: 363, P. 142981 - 142981

Published: July 30, 2024

The quantification of pesticide dissipation in agricultural soil is challenging. In this study, we investigated atrazine biodegradation both liquid and experiments bioaugmented with distinct atrazine-degrading bacterial isolates. This was achieved by combining

Language: Английский

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Compound specific isotope analysis in hydrogeology

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 615, P. 128588 - 128588

Published: Oct. 31, 2022

Language: Английский

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Compound-Specific Isotope Analyses to Investigate Pesticide Transformation in Soil and Water

Published: Jan. 1, 2024

Abstract This chapter provides an overview of approaches employed in tracking pesticide degradation within agricultural catchments, focusing on the existing challenges and burgeonic prospects afforded by compound-specific isotope analyses (CSIA). The discussion centers development CSIA for low concentrations pesticides environmental matrices. Additionally, explores viability implementing field applications tasks such as source apportionment, discerning transformation reactions, quantifying extent a catchment scale.

Language: Английский

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Insight into Imidacloprid Degradation through Compound Specific Carbon Isotope Analysis and High-Resolution Mass Spectrometry

ACS ES&T Water, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 6, 2024

The insecticide imidacloprid (IMI) is an ubiquitous environmental contaminant. This study presents approach to investigate its degradation through the combined use of compound-specific stable carbon isotope analysis and high-resolution mass spectrometry (HRMS). It demonstrates how ratio HRMS product can complement each other. photolysis by simulated sunlight, UV–C (λ = 254 nm), alkaline hydrolysis all exhibited distinguishable enrichment factors (εC). largest fractionation observed during at pH 12 30 °C (εC −3.9 ± 0.4‰). confirms that only one atom in a reactive position, allowing AKIE calculation −34.1 3.7‰). Carbon were not significantly affected dissolved oxygen content or pH. Irradiation did result significant enrichment, whereas experiments with sunlight yielded εC values between −1.1 0.1 −1.4 0.1‰. was hypothesized increased contribution indirect led isotopic enrichment. Finally, we demonstrate developed method be used determine fingerprint veterinary flea control products.

Language: Английский

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Effects of atrazine and S-metolachlor on stream periphyton taxonomic and fatty acid composition

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: May 25, 2023

Abstract Extensive pesticide use for agriculture diffusely pollutes aquatic ecosystems through leaching and runoff events has the potential to negatively affect non-target organisms. Atrazine S-metolachlor are two widely used herbicides often detected in high concentrations rivers that drain nearby agricultural lands. To determine effects of these on river ecosystems, we conducted a 14-day laboratory experiment expose periphyton wide range atrazine concentrations. The response was evaluated using ecologically relevant endpoints including chlorophyll fluorescence fatty acids composition. Results showed disrupted photoautotroph biomass measured by fluorescence. Both caused dissimilarities acid profiles between control exposure concentrations, but had stronger effect than observe increase or reduction saturated (SFAs) very long chain (VLCFAs). Our study demonstrates commonly herbicides, S-metolachlor, can composition stream periphyton, thereby altering nutritional quality this resource primary consumers.

Language: Английский

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Quel est le rôle des retenues collinaires pour limiter les flux de pesticides dans le paysage agricole ?

Sciences Eaux & Territoires, Journal Year: 2023, Volume and Issue: 43, P. 49 - 56

Published: Oct. 9, 2023

Les systèmes aquatiques tels que les mares, zones humides, bassins d’orage, retenues collinaires, ci-après nommées « d’eau », sont des de rétention d'eau omniprésents dans versants agricoles. Ces opèrent comme réacteurs biogéochimiques naturels, contrôlant la dissipation et le transfert contaminants agricoles, dont pesticides, à l'échelle du bassin versant. De façon complémentaire aux mesures pratiques réduction voire d’élimination l’utilisation pesticides synthèse, projet PESTIPOND (2018-2023), financé par l’Agence nationale recherche (ANR), s’est intéressé au rôle transferts résultats principaux présentés cet article. a permis mieux comprendre, hiérarchiser prédire processus qui conditionnent comment régit versant conditions hydro-climatiques d'exploitation agricole variables. Pour intégrer aspects multi-échelles dynamiques cette problématique, un cadre modélisation tenant compte est proposé pour améliorer prédiction l'évaluation risques vers écosystèmes aquatiques.

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