A strategy for an initial assessment of the ecotoxicological effects of transformation products of pesticides in aquatic systems following a tiered approach

Hensen, Birte; Olsson, Oliver; Kümmerer, Klaus

doi:10.1016/j.envint.2020.105533

Cited by 44 publications

(26 citation statements)

References 57 publications

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“…In the environment, pesticides are subject to degradation by both abiotic (e.g., hydrolysis, photolysis) and biotic (e.g., plant metabolism, microbial degradation) processes (Fenner et al, 2013). If degradation is incomplete, pesticides form transformation products (TPs), which in some cases may be equally or more mobile, persistent, or toxic than their parent compounds (PCs; Hensen et al, 2020). Strongest mobilization of pesticides is usually associated with the first significant rainfall after application and fast discharge components (Doppler et al, 2012;Olsson et al, 2013;Lefrancq et al, 2017), e.g., runoff from non-target areas like roads (Lefrancq et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Pesticide peak concentration reduction in a small vegetated treatment system controlled by chemograph shape

Greiwe

Olsson

Kümmerer

et al. 2021

Hydrol. Earth Syst. Sci.

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Abstract. Pesticides may impact aquatic ecosystems when entering water bodies. Measures for mitigation against pesticide inputs include vegetated treatment systems (VTSs). Some of these systems have very short hydraulic retention time (< 1 h) but nevertheless manage to effectively reduce peak concentrations of contaminants as a result of dispersion. We hypothesize that the effect of dispersion on contaminant mitigation in VTSs depends on the shape of the contaminant input signal chemograph, which in turn is related to factors affecting contaminant mobilization in the contributing catchment. In order to test this hypothesis, we grouped chemographs of six contaminants originating from a viticultural catchment during 10 discharge events into clusters according to chemograph shape. We then compared peak concentration reduction and mass removal in a downstream VTS, both among clusters and in terms of compound properties and discharge dynamics. We found that chemograph clusters reflected combined effects of contaminant source areas, transport pathways, and discharge dynamics. While mass loss was subject to major uncertainties, peak concentration reduction rate was clearly related to chemograph clusters and dispersion sensitivity. These findings suggest that mitigation of acute toxicity in a VTS is stronger for compounds with sharp-peaked chemographs, whose formation is related to the contributing catchment and can be analyzed by chemograph clustering.

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Section: Introductionmentioning

confidence: 99%

Pesticide peak concentration reduction in a small vegetated treatment system controlled by chemograph shape

Greiwe

Olsson

Kümmerer

et al. 2021

Hydrol. Earth Syst. Sci.

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“…4). Two of the four detected TPs (diuron-desmethyl and terbuthylazin-2-hydroxy) are described as most probably toxic or probably toxic (Hensen et al, 2020).…”

Section: Standing Water In Swale (Step 1)mentioning

confidence: 97%

“…Diuron, terbutryn and OIT degrade to various transformation products, TPs (Hensen et al, 2020). In this study we focus on three TPs of terbutryn (terbuthylazin-2-hydroxy, terbutryn-desethyl, terbumeton) and one TP of diuron (diuron-desmethyl).…”

Section: Introductionmentioning

confidence: 99%

“…Terbumeton is a photo degradation product that tends to remain on facades (Bollmann et al, 2017a). Terbutryn-desethyl, terbuthylazin-2-hydroxy and terbumeton were classified as probably toxic (Hensen et al, 2020). Diuron-desmethyl was identified as a photo TP (Burkhardt et al, 2012;Hensen et al, 2018) and but is possibly also formed by microorganisms in soil (Hensen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Moschet et al (2014) confirmed diuron-desmethyl in rivers in Switzerland at concentrations ranging from 10 to ng L -1 . Diurondesmethyl was classified as most probably toxic or probably toxic (Hensen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Sources and pathways of biocides and their transformation products in urban water infrastructure of a 2 ha urban district

Linke¹,

Olsson²,

Preusser³

et al. 2021

Preprint

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Abstract. Biocides used in film protection products leaching from facades are known to be a potential threat for the environment. This study identifies individual sources and entry pathways in a small-scale urban area. We investigate emissions of commonly used biocides (terbutryn, diuron and octylisothiazolinone (OIT)) and some of their transformation products (TPs; diuron-desmethyl, terbumeton, terbuthylazin-2-hydroxy and terbutryn-desethyl) from a 2 ha residential area, 13 years after construction has ended. Sampling utilizes existing urban water infrastructure representative for decentralized storm water management in central and northern Europe and applies a two-step approach to (a) determine the occurrence of biocides above water quality limits (i.e. predicted no effect concentration, PNEC) and (b) identify source areas and characterize entry pathways into surface- and groundwater. Monitoring focuses on the analysis of selected biocides and TPs by LC-MS/MS in water samples taken from facades, rainwater pipes, drainage and storm water infiltration systems. In standing water in a swale we found high concentrations of diuron (174 ng L−1) and terbutryn (40 ng L−1) above PNEC for surface water. We confirmed expected sources, i.e. facades, but sampling of rain downpipes from flat roofs identified additional sources of all biocides and two TPs of terbutryn and one TP of diuron. Diuron and terbutryn were found in three drainage pipes representing different entry pathways of biocides. In one drainage pipe collecting road runoff only diuron-desmethyl and terbutryn-desethyl were detected. In two other drainage pipes collecting infiltrated water through soil additionally terbuthylazin-2-hydroxy was detected. Concentration of terbutryn and two of its TPs (terbutryn-desethyl and terbuthylazin-2-hydroxy) were highest in one of the pipes collecting infiltrated water through soil which suggests a high leaching potential of this biocide. This study shows that target-oriented monitoring of urban water infrastructure for biocides and their TPs allows for a better identification of biocide emissions into urban aquatic environments.

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Pesticides

Domínguez¹,

Ruiz²,

Frenich³

et al. 2022

Analytical Methods for Environmental Contaminants of Emerging Concern

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A strategy for an initial assessment of the ecotoxicological effects of transformation products of pesticides in aquatic systems following a tiered approach

Cited by 44 publications

References 57 publications

Pesticide peak concentration reduction in a small vegetated treatment system controlled by chemograph shape

Pesticide peak concentration reduction in a small vegetated treatment system controlled by chemograph shape

Sources and pathways of biocides and their transformation products in urban water infrastructure of a 2 ha urban district

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