Degradation and leaching of bentazone, terbuthylazine and S-metolachlor and some of their metabolites: A long-term lysimeter experiment

Schuhmann, Andrea; Klammler, Gernot; Weiß, Stefan; Gans, Oliver; Fank, Johann; Haberhauer, Georg; Gerzabek, Martin H.

doi:10.17221/803/2018-pse

Cited by 23 publications

(14 citation statements)

References 19 publications

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“…Bentazone decomposed faster in soil than TER and S-metolachlor, but TER metabolization after the second application resulted in higher formation of desethylterbuthylazine and TER hydroxylation. On day 12, the greatest concentration of TER (310 g/kg) was found while the topsoil contained 16 g/kg of terbuthylazine on day 150, indicating leaching losses [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Occurrence of Banned and Currently Used Herbicides, in Groundwater of Northern Greece: A Human Health Risk Assessment Approach

Parlakidis

González

Gikas

et al. 2022

IJERPH

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The presence of pesticide residues in groundwater, many years after their phase out in European Union verifies that the persistence in aquifer is much higher than in other environmental compartments. Currently used and banned pesticides were monitored in Northern Greece aquifers and a human health risk assessment was conducted. The target compounds were the herbicides metolachlor (MET), terbuthylazine (TER), atrazine (ATR) and its metabolites deisopropylatrazine (DIA), deethylatrazine (DEA) and hydroxyatrazine (HA). Eleven sampling sites were selected to have representatives of different types of wells. Pesticides were extracted by solid-phase extraction and analyzed by liquid chromatography. MET was detected in 100% of water samples followed by ATR (96.4%), DEA and HA (88.6%), DIA (78.2%) and TER (67.5%). ATR, DIA, DEA, HA, MET and TER mean concentrations detected were 0.18, 0.29, 0.14, 0.09, 0.16 and 0.15 μg/L, respectively. Obtained results were compared with historical data from previous monitoring studies and temporal trends were assessed. Preferential flow was the major factor facilitating pesticide leaching within the month of herbicide application. Moreover, apparent age of groundwater and the reduced pesticide dissipation rates on aquifers resulted of long-term detection of legacy pesticides. Although atrazine had been banned more than 18 years ago, it was detected frequently and their concentrations in some cases were over the maximum permissible limit. Furthermore, human health risk assessment of pesticides was calculated for two different age groups though drinking water consumption. In all examined wells, the sum of the HQ values were lower than the unity. As a result, the analyzed drinking water wells are considered safe according to the acute risk assessment process. However, the presence of atrazine residues causes concerns related with chronic toxicity, since ATR R values were greater than the parametric one of 1 × 10−6 advised by USEPA, for both age groups.

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Section: Resultsmentioning

confidence: 99%

Occurrence of Banned and Currently Used Herbicides, in Groundwater of Northern Greece: A Human Health Risk Assessment Approach

Parlakidis

González

Gikas

et al. 2022

IJERPH

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“…It is necessary to highlight that the water molecules have high polarity and can compete with herbicide molecules for particle adsorption sites in the soil. In dry soils, the herbicides are strongly adsorbed, while in moist soils, the herbicide molecules are dissolved in solution and can easily penetrate the soil (Schuhmann et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Leaching potential of S-metolachlor in a medium-textured Oxisol soil with bioindicator plants

Silva

Marques

Silva

et al. 2022

Rev. bras. eng. agríc. ambient.

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Information about the impact of herbicides in the soil based on the growth of bioindicator species is extremely useful in developing crop management strategies. Therefore, this study aims to evaluate the leaching potential of the herbicide S-metolachlor under different natural precipitations in medium-textured Oxisol using bioindicator plants. A completely randomized experimental design was adopted, with four replicates and treatments arranged in a 3 × 8 factorial scheme [three indexes of precipitation occurred in the environment before the collection of the samples (50, 91, and 131 mm) and eight depths in the soil profile (0-0.03; 0.03-0.06; 0.06-0.09; 0.09-0.12; 0.12-0.15; 0.15-0.20; 0.20-0.25; 0.25-0.30 m)]. PVC columns were used, maintaining the original soil integrity during sampling after accumulating the stipulated natural precipitation. Longitudinal sections separated the columns to sow the bioindicator species (cucumber, lettuce, Alexander grass, and sorghum). The phytotoxicity symptoms of bioindicator plants were evaluated, adopting a phytotoxicity visual scale between 0 and 100%, at 5, 7, 9, and 11 days after seeding. The responses of the bioindicator species to the residual effect of the herbicide S-metolachlor were variable and depended on the rainfall level. Generally, in a medium-textured Oxisol, the higher values of concentration of S-metolachlor occurs in depths ranging between 0 and 0.06 m. The maximum leaching depth detected was 0.12-0.15 m with 131 mm of precipitation. Cucumber was the most sensitive species to the presence of S-metolachlor in an Oxisol of medium-texture since it presents symptoms of phytotoxicity at higher depths.

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“…Ces contraintes analytiques font que les données de terrain relatives à la contamination par les PT sont encore extrêmement rares (Fonseca et al, 2019) bien que les questionnements concernant les PT aient connu un fort développement ces dernières années (Melin et al, 2020). Sachant que les TP, issus de la transformation des composés parents, sont souvent plus stables et donc potentiellement plus présents dans l'environnement (Schuhmann et al, 2019), il est pertinent de déterminer avec précision l'ampleur de la contamination environnementale (Gruchlik et al, 2018) notamment dans les cours d'eau de tête.…”

Section: Conclusion Et Perspectivesunclassified

L’étang piscicole de barrage sur la balance : L’abattement de la contamination des eaux par les étangs est-il un service de poids ?

Banas¹,

Cor²,

Gaillard³

et al. 2020

dynenviron

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Les étangs de barrage, élément d’origine anthropique, induisent une rupture du continuum écologique du cours d’eau de tête de bassin versant. Pour cette raison, leur gestion voire leur maintien ou leur effacement sont régulièrement questionnés. Ces milieux aquatiques sont également susceptibles de rendre divers services (ex. production de poisson, soutien à l’économie rural, zone d’intérêt pour la faune et en particulier l’ichtyofaune). Si ces éléments ne constituent pas un atout dans le cadre de la réglementation sur l’eau (ex. DCE, LEMA), le « bon état » des masses d’eau peut être mis à mal par cette discontinuité. Peu étudiés, les impacts positifs et négatifs de la présence d’étang de barrage nécessitent d’être évalués avec précision. Cet article s’attache à faire le point sur le service de remédiation (i.e. rétention de contaminants au sein de l’étang) induit par l’étang de barrage et mis en évidence par nos études menées en France. Si l’étang ne semble pas constituer un outil intéressant pour réduire la contamination des cours d’eau par les éléments traces métalliques, nos travaux montrent une réduction des concentrations et quantités de nutriments en aval de l’étang, ainsi qu’une réduction de près de 60 % de la somme des pesticides. Une rétention est également observée pour les produits de transformation des pesticides qui sont déjà quantifiés dans le cours d’eau de tête de bassin, en amont de l’étang. Ces résultats montrent que l’impact de l’étang sur le bon état de la masse d’eau résulte de mécanismes biologiques et chimiques complexes. Selon les priorités de gestion (i.e. rétablissement du continuum écologique ; maitrise des concentrations en pesticides), les décisions de gestion de ces plans d’eau pourront alors s’avérer elles-mêmes complexes.

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Degradation and leaching of bentazone, terbuthylazine and S-metolachlor and some of their metabolites: A long-term lysimeter experiment

Cited by 23 publications

References 19 publications

Occurrence of Banned and Currently Used Herbicides, in Groundwater of Northern Greece: A Human Health Risk Assessment Approach

Occurrence of Banned and Currently Used Herbicides, in Groundwater of Northern Greece: A Human Health Risk Assessment Approach

Leaching potential of S-metolachlor in a medium-textured Oxisol soil with bioindicator plants

L’étang piscicole de barrage sur la balance : L’abattement de la contamination des eaux par les étangs est-il un service de poids ?

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