Evaluation of the behaviour of propoxycarbazone herbicide in soils and water under different conditions. Post-targeted study

Vargas-Pérez, Marta; González, Francisco Javier Egea; Frenich, Antonia Garrido

doi:10.1016/j.ecoenv.2019.109506

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…The Xcalibur™ software version 3.0.63, with Quan browser and Qual browser were used for optimization and quantification of the pesticide and its metabolites. 21 Data was processed with a homemade database containing the specific data of the potential fluopyram metabolites. 20 Table 1 shows the exact mass and molecular formula of the proposed metabolites.…”

Section: Methodsmentioning

confidence: 99%

Dissipation and residue determination of fluopyram and its metabolites in greenhouse crops

2020

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BACKGROUND Fluopyram is a pesticide widely used in tomato and cucumber crops cultivation to control fungal diseases that develop especially in environments with moderate temperatures and high humidity, such as in a greenhouse. The pathway of fluopyram dissipation has been monitored in cucumber and cherry tomato under greenhouse conditions. RESULTS In the greenhouse trials, cherry tomato and cucumber were treated by irrigation water with the commercial product at the manufacturer’s recommended dose and double dose. High‐resolution mass spectrometry (HRMS) coupled to ultra‐high‐performance liquid chromatography (UHPLC) has been selected as the technique to obtain the identification of fluopyram and metabolites. The fate of fluopyram in greenhouse tomato and cucumber was investigated over 44 days. The metabolic pathway of fluopyram was: in a first step there was a primary transformation to fluopyram‐7‐hydroxy and fluopyram‐8‐hydroxy, isomeric compounds, and in a second phase to fluopyram‐benzamide and fluopyram‐pyridyl‐carboxylic acid. The behavior of fluopyram does not fit any type of kinetic classical model of degradation. CONCLUSIONS Greenhouse trials revealed that the fluopyram is a very persistent compound, and their terminal residues do not exceed maximum residue level (MRL) at the end of the study. © 2020 Society of Chemical Industry

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Section: Methodsmentioning

confidence: 99%

Dissipation and residue determination of fluopyram and its metabolites in greenhouse crops

2020

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Biphasic models improved S‐metolachlor dissipation endpoint predictions

Kouame,

Savin,

Willett

et al. 2024

Agrosystems Geosci & Env

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Accurate predictions of herbicide dissipation endpoints are essential for making environmental management decisions, estimating the duration of weed control, and deciding crop replant and rotation options. The performance of the single first‐order (SFO), first‐order multiple‐compartment (FOMC), bi‐exponential (BEXP), first‐order double‐exponential decay (FODED), and first‐order two‐compartment (FOTC) was evaluated to describe S‐metolachlor dissipation. Results showed that the BEXP and FOTC were not appropriate. The FODED was ranked as the top model with the lowest Akaike's information criterion (AICc) value among the other three candidate models and was followed by the FOMC model. The SFO displayed the largest root mean square error (11.43) and mean absolute error (9.16) values, and the smallest Nash–Sutcliffe efficiency value (0.88) within the set of three appropriate candidate models. The SFO predicted a time it takes the herbicide to dissipate to one‐eighth of its original concentration, 21 and 26 days shorter than that predicted by the FOMC and FODED, respectively. The SFO also predicted a time for S‐metolachlor to dissipate to one‐tenth of its original concentration, 33 days shorter than that predicted by both FOMC and FODED. Therefore, even though the SFO is effective at predicting half‐life, caution might be required when making inferences about DT90 or the time required for the dissipation of 90% of the initial concentration of pesticides in the soil using the SFO.

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Physiochemical assessment of environmental behaviors of herbicide atrazine in soils associated with its degradation and bioavailability to weeds

Liu¹,

Zhou

Guo

et al. 2021

Chemosphere

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Evaluation of the behaviour of propoxycarbazone herbicide in soils and water under different conditions. Post-targeted study

Cited by 3 publications

References 19 publications

Dissipation and residue determination of fluopyram and its metabolites in greenhouse crops

Dissipation and residue determination of fluopyram and its metabolites in greenhouse crops

Biphasic models improved S‐metolachlor dissipation endpoint predictions

Physiochemical assessment of environmental behaviors of herbicide atrazine in soils associated with its degradation and bioavailability to weeds

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