Using compound-specific isotope analysis to assess the degradation of chloroacetanilide herbicides in lab-scale wetlands

Elsayed, Omniea F.; Maillard, Elodie; Vuilleumier, Stéphane; Nijenhuis, Ivonne; Richnow, Hans H.; Imfeld, Gwenaël

doi:10.1016/j.chemosphere.2013.10.027

Cited by 57 publications

(49 citation statements)

References 36 publications

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“…With a mean ε C of −0.9 ± 0.3 ‰ and a best-fit value of −1.13 ‰ in this study, the calibrated ε C for S-metolachlor is smaller (i.e. corresponding to less fractionation) than experimentally determined ε C values for the chloroacetanilides alachlor (ε C = −2.0 ± 0.3 ‰) and acetochlor (ε C = −3.4 ± 0.5 ‰ ; Elsayed et al, 2014). This is also the case for the two alternative model setups discussed above (i.e.…”

Section: Insights On Pesticide Fate and Transport From The Modelmentioning

confidence: 83%

“…Laboratory-derived carbon enrichment factors of pesticides are subject to uncertainty ranges typically between ±0.1 ‰ and ±1.0 ‰ (Elsayed et al, 2014;Meyer and Elsner, 2013;Wu et al, 2014). In order to assess the uncertainty in Rayleigh equation estimates, we considered an uncertainty range of ±0.5 ‰ for ε C around the best-fit value (i.e.…”

Section: Degradation Assessment With the Rayleigh Equation And The Modelmentioning

confidence: 99%

“…Quantification and CSIA of S-metolachlor and acetochlor are described in detail elsewhere (Elsayed et al, 2014). Briefly, 1 L water samples were filtered, extracted by solidphase extraction (SPE), concentrated under nitrogen flux to one droplet, and resuspended in 500 µL dichloromethane (DCM).…”

Section: Concentration and Csia Analysismentioning

confidence: 99%

“…Although CSIA may provide evidence of pesticide degradation (Fenner et al, 2013), CSIA data of pesticides remain restricted to the analysis of isotope fractionation under laboratory conditions (Hartenbach et al, 2008;Meyer and Elsner, 2013;Meyer et al, 2009;Penning et al, 2010;Reinnicke et al, 2011;Wu et al, 2014) and grab samples of groundwater and streamwater (Milosevic et al, 2013;Schreglmann et al, 2013). Degradation of chloroacetanilide herbicides and associated isotope fractionation have been recently studied in lab-scale wetlands (Elsayed et al, 2014), but CSIA of herbicides has not yet been applied on catchment scale to evaluate in situ degradation of pesticides. This study presents the first field CSIA data of pesticides in surface runoff and streamwater from an agricultural catchment.…”

mentioning

confidence: 99%

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Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Lutz

Velde

Elsayed

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Compound-specific stable isotope analysis (CSIA) has proven beneficial in the characterization of contaminant degradation in groundwater, but it has never been used to assess pesticide transformation on catchment scale. This study presents concentration and carbon CSIA data of the herbicides S-metolachlor and acetochlor from three locations (plot, drain, and catchment outlets) in a 47 ha agricultural catchment (Bas-Rhin, France). Herbicide concentrations at the catchment outlet were highest (62 µg L −1 ) in response to an intense rainfall event following herbicide application. Increasing δ 13 C values of S-metolachlor and acetochlor by more than 2 ‰ during the study period indicated herbicide degradation. To assist the interpretation of these data, discharge, concentrations, and δ 13 C values of S-metolachlor were modelled with a conceptual mathematical model using the transport formulation by travel-time distributions. Testing of different model setups supported the assumption that degradation half-lives (DT50) increase with increasing soil depth, which can be straightforwardly implemented in conceptual models using travel-time distributions. Moreover, model calibration yielded an estimate of a field-integrated isotopic enrichment factor as opposed to laboratory-based assessments of enrichment factors in closed systems. Thirdly, the Rayleigh equation commonly applied in groundwater studies was tested by our model for its potential to quantify degradation on catchment scale. It provided conservative estimates on the extent of degradation as occurred in stream samples. However, largely exceeding the simulated degradation within the entire catchment, these estimates were not representative of overall degradation on catchment scale. The conceptual modelling approach thus enabled us to upscale sample-based CSIA information on degradation to the catchment scale. Overall, this study demonstrates the benefit of combining monitoring and conceptual modelling of concentration and CSIA data and advocates the use of traveltime distributions for assessing pesticide fate and transport on catchment scale.

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Section: Insights On Pesticide Fate and Transport From The Modelmentioning

confidence: 83%

Section: Degradation Assessment With the Rayleigh Equation And The Modelmentioning

confidence: 99%

Section: Concentration and Csia Analysismentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Lutz

Velde

Elsayed

et al. 2017

Hydrol. Earth Syst. Sci.

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“…For fate assessment in soil and groundwater, detecting and observing concentration changes of the pesticides and their metabolites is often not conclusive. Compound-specific isotope analysis (CSIA) is a promising tool for assessing transport and fate in the environment of these compounds 1,2 . CSIA is a well-established method to identify and quantify degradation pathways of priority pollutants such as chlorinated solvents and petroleum hydrocarbons 3 .…”

Section: Introductionmentioning

confidence: 99%

Fate of Four Herbicides in an Irrigated Field Cropped with Corn: Lysimeter Experiments

Torrentó¹,

Bakkour²,

Ryabenko³

et al. 2015

Procedia Earth and Planetary Science

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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 the mobility of the studied compounds through the soil and the vadose zone during the first days after herbicides application. The detection of metabolites in drainage water confirmed herbicides degradation once higher residence times in the soil zone where achieved. An efficient preconcentration procedure was developed for 10-L drainage water samples to achieve enough analyte enrichment for C, N and Cl isotope ratios measurements. Methods for isotope analyses are currently being developed and the applicability of CSIA for assessing the in situ biodegradation of the target pesticides during transport in soil and vadose zone will be evaluated.

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Herbicide Residues in Biota, Analysis of

Headley

Dickson

Cessna

et al. 2015

Encyclopedia of Analytical Chemistry

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Herbicides are used in agriculture to increase productivity by controlling and inhibiting production of unwanted plants interfering with proper growth and nourishment of valuable crops. Anthropogenic activities have promoted widespread occurrence of herbicide residues in various biota resulting in concerns for animal (including human) and environmental health. This article examines current extraction, cleanup, and instrumental methods available for analyzing herbicide residues in biota, integrating multiresidue methods (MRMs) and miniaturization of apparatus to reduce solvent volumes required for sample extraction and analysis. Methods using miniaturized procedures are additionally beneficial because they tend to be generally less expensive, faster, and less labor intensive than conventional methods and, furthermore, they reduce analyst exposure to hazardous materials. Mass spectrometry (MS), interfaced with high‐resolution gas chromatography (GC) and high‐performance liquid chromatography (HPLC), has become the detection and quantification method of choice for herbicide analysis with many recent improvements due to advances in ionization techniques and analyzer power. These advancements have resulted in higher levels of accuracy, sensitivity, and selectivity, as well as higher sample throughput. Immunoassay (IA) techniques have also emerged as important tools in the detection of herbicides in biota.

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Using compound-specific isotope analysis to assess the degradation of chloroacetanilide herbicides in lab-scale wetlands

Cited by 57 publications

References 36 publications

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Fate of Four Herbicides in an Irrigated Field Cropped with Corn: Lysimeter Experiments

Herbicide Residues in Biota, Analysis of

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