Dissipation of hydrological tracers and the herbicide S-metolachlor in batch and continuous-flow wetlands

Maillard, Elodie; Lange, Jens; Schreiber, Steffi; Dollinger, Jeanne; Herbstritt, Barbara; Millet, Maurice; Imfeld, Gwenaël

doi:10.1016/j.chemosphere.2015.11.027

Cited by 34 publications

(28 citation statements)

References 34 publications

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“…The results of the breakthrough curves also revealed that the alternation of different hydrologic conditions (saturation with 30 drying periods) enhanced transformation processes, as already reported in other studies (Vymazal et al, 2015;Maillard et al, 2016). Indeed, the maximum relative concentration of metazachlor TPs were measured after the promotion of aerobic conditions during the drying period.…”

supporting

confidence: 84%

“…UR, on the other hand, displayed comparatively lower recoveries, and based on the small amounts found in the sediments, sorption processes were not relevant for its dissipation. Thus, it is most likely that degradation via (bio-)chemical transformation was the dominant process for UR, as already reported in other long-term studies (Maillard et al, 2016;Lange et al, 2018, Fernández-10 Pascual et al, 2018. Likewise, biochemical transformation contributed to metazachlor dissipation, as was confirmed by the measurements of its TPs, whereas the transformation of boscalid and penconazole could not be proven.…”

supporting

confidence: 56%

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Hydrological tracers for assessing transport and dissipation processes of pesticides in a model constructed wetland system

Fernández-Pascual¹,

Bork²,

Hensen³

et al. 2019

Preprint

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Abstract. Hydrological tracers have been recently used as a low-cost approach to study the fate and transport of pesticides in constructed wetlands. Yet, internal temporal and spatial mechanisms that dominate their transport and dissipation in such environments are still not fully understood. We have applied three tracers with different sorptive and reactive properties: bromide (Br), uranine (UR) and sulforhodamine B (SRB) to investigate dominant temporal and spatial transport and dissipation processes of three selected pesticides: boscalid, penconazole and metazachlor in a model constructed wetland system designed to perform high vertical-resolution sampling and monitoring on a long-term basis. The experimental observations revealed that two different preferential flow paths developed, one due to the constructional design of the inflow and the other one due to the influence of the free water at the surface along with the plants. Transport of solutes was driven by the injections and dominated for Br, UR and metazachlor. The final mass balance highlighted that the main dissipation pathways were sorption, transformation and plant uptake. Sorption was detected immediately after the injection of solutes, while transformation was enhanced by the presence of plants and the promotion of aerobic conditions. The detection of metazachlor transformation products confirmed the contribution of transformation to metazachlor dissipation, whereas boscalid and penconazole mainly experienced sorption processes. The use of hydrological tracers together with selected pesticides and coupled with high vertical-resolution sampling and monitoring proved to provide valuable information about transport vectors and dissipation processes of pesticides in a vegetated redox-dynamic environment on a long-term basis and detailed spatial scale.

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supporting

confidence: 84%

supporting

confidence: 56%

Hydrological tracers for assessing transport and dissipation processes of pesticides in a model constructed wetland system

Fernández-Pascual¹,

Bork²,

Hensen³

et al. 2019

Preprint

Self Cite

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“…These authors examined enantiomer ratios for metolachlor while also monitoring MESA to establish this non-enantioselectivity; however, others have just examined the disappearance of enantiomers of metolachlor, and there are contradicting reports for chiral selectivity. Ma et al (2006) showed preferential degradation of the S-enantiomers and Maillard et al (2016) showed preferential degradation of the R-enantiomer while Aboul Eish and Wells (2008) found no enantioselectivity. Since there is controversy on this point and no conclusive evidence to contradict us we assumed for this paper that enantiomeric changes in metolachlor commercial products should be reflected in similar chiral shifts in MESA, i.e., the applied product of 88% S-metolachlor will produce S-MESA that has the same enantiomeric composition.…”

Section: Introductionmentioning

confidence: 94%

Analysis of metolachlor ethane sulfonic acid (MESA) chirality in groundwater: A tool for dating groundwater movement in agricultural settings

Rice

McCarty

Bialek-Kalinski

et al. 2016

Science of The Total Environment

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“…This "multi-tracer approach" characterises environmental compartments and predicts the fate of chemically similar substances such as pesticides (e.g. Sabatini and Austin, 1991;Passeport et al, 2010;Lange et al, 2011;Schuetz et al, 2012;Maillard et al, 2016). So far, UR has mainly been used in surface waters as a tracer for light decay (Lange et al, 2011;Gutowski et al, 2015), while SRB was found to be suitable to mimic adsorption on sediments (Durst et al, 2013;Dollinger et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Controls of fluorescent tracer retention by soils and sediments

Bork

Lange

Graf‐Rosenfellner

et al. 2020

Hydrol. Earth Syst. Sci.

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Abstract. Fluorescent dyes like uranine (UR) and sulforhodamine B (SRB) have been used for decades as artificial tracers in hydrological studies. Recently, attempts have been made to trace organic pollutants in soil with such dyes, but the knowledge of the controls of sorption of UR and SRB in soils is still incomplete and poorly standardised. For this reason, we selectively controlled clay, organic matter (OM) and pH within batch experiments and quantified systematically the impact and possible interactions of these controls on the adsorption of UR and SRB. Sorption isotherms were determined using a sandy sediment and a silty loamy subsoil and topsoil (0.6–2.8 % organic carbon (OC)) at pH values of 5.5, 6.5 and 7.5. Additionally, OM was removed from topsoil and subsoil samples by H2O2 treatment and the clay mineral montmorillonite was added to the sandy sediment. We found a negative relationship between the linear sorption coefficient Kd and pH that was stronger for UR than for SRB. Increasing repulsion forces between negative sorption sites and tracer functional groups at higher pH values might explain these results. Adsorption of UR and SRB increased with increasing clay content due to more specific surface area and associated sorption sites. An addition of 4 % of the clay mineral montmorillonite sufficed to adsorb nearly 100 % of both tracers. The influence of OM was more complex: while the adsorption of UR increased with increasing OC concentration, the opposite was observed for SRB. Our study indicates the high relevance of physico-chemical properties of soils and sediments for the fate of applied tracers and for their more conservative or non-conservative behaviour. Overall, the reported results will help to optimise the use of fluorescent tracers in terrestrial ecosystems and to increase their potential as a cheap and fast tool to gain insights into the fate of pollutants in soils and sediments.

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Dissipation of hydrological tracers and the herbicide S-metolachlor in batch and continuous-flow wetlands

Cited by 34 publications

References 34 publications

Hydrological tracers for assessing transport and dissipation processes of pesticides in a model constructed wetland system

Hydrological tracers for assessing transport and dissipation processes of pesticides in a model constructed wetland system

Analysis of metolachlor ethane sulfonic acid (MESA) chirality in groundwater: A tool for dating groundwater movement in agricultural settings

Controls of fluorescent tracer retention by soils and sediments

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