Sorption of the Herbicide Dichlobenil and the Metabolite 2,6-Dichlorobenzamide on Soils and Aquifer Sediments

Clausen, Liselotte; Larsen, Flemming; Albrechtsen, Hans‐Jørgen

doi:10.1021/es035263i

Cited by 62 publications

(30 citation statements)

References 30 publications

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“…The former possibility is at least partly true as the compounds in question were found to adsorb onto the soil (Dagnac et al, 2005) and significant sorption capacity of some vadose zone solids could be demonstrated (Clausen et al, 2004). On the other hand, the transit time of the compounds through the several meters thick vadose zone may exceed the time elapsed since the application of AT was halted.…”

Section: Discussionmentioning

confidence: 99%

Deposition, persistence and turnover of pollutants: First results from the EU project AquaTerra for selected river basins and aquifers

Barth

Steidle

Kuntz

et al. 2007

Science of The Total Environment

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Deposition, turnover and movement of persistent organic pollutants (POP) were investigated in the EU integrated project "AquaTerra", which is among the first funded environmental projects within the 6th Framework Program by the European Commission. Project work integrates across various disciplines that range from biogeochemistry, environmental engineering, computer modelling and chemistry to socio-economic sciences. Field study areas are the river basins of the Ebro, the Meuse, the Elbe and the Danube as well as the 3-km 2 French catchment of the Brévilles Spring. Within the first 2 years of the project more than 1700 samples of atmospherically deposited particles, sediments, and water have been collected in the above-mentioned systems. Results show clear spatial patterns of deposition of polyaromatic hydrocarbons (PAHs) with the highest rates in the Meuse Basin. For local inputs, in the Brévilles sandy aquifer, the contamination of the groundwater by the pesticides atrazine (AT) and deethylatrazine did not decrease even 5 years after their agricultural inputs were stopped. On the other hand, herbicides such as mecroprop (MCPP), and PAHs, were at least partially degraded microbiologically in laboratory studies with soils and aquifer material from selected sites. For sediment transport of contaminants, new flood sampling techniques revealed highest deposition rates of β-hexachlorocyclohexane (β−HCH) in river sediments at hotspot areas on the Mulde River in the Bitterfeld region (Elbe Basin, Germany). These selected preliminary results of AquaTerra help to improve fundamental understanding of persistent organic pollutants (POP) in the environment.

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Section: Discussionmentioning

confidence: 99%

Deposition, persistence and turnover of pollutants: First results from the EU project AquaTerra for selected river basins and aquifers

Barth

Steidle

Kuntz

et al. 2007

Science of The Total Environment

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“…However, as the linear Freundlich isotherm produced similar results at depths greater than 0.9 m, the Langmuir isotherm was not used at these depths in order to save computing time. Clausen et al (2004) found a linear correlation between the total organic carbon content (TOC) and sorption of dichlobenil and BAM as long as the TOC > 1.0 g kg −1 :…”

Section: Vadose Zone Modelmentioning

confidence: 98%

Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

Bergvall

Grip

Sjöström

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Few studies have been carried out that cover the entire transport process of pesticides, from application at the soil surface, through subsurface transport, to contamination of drinking water in esker aquifers. In formerly glaciated regions, such as Scandinavia, many of the most important groundwater resources are situated in glaciofluvial eskers. The purpose of the present study was to model and identify significant processes that govern subsurface transport of pesticides in extensive glaciofluvial and littoral sediments. To simulate the transport processes, we coupled a vadose zone model at soil profile scale to a regional groundwater flow model. The model was applied to a municipal drinking-water aquifer, contaminated with the pesticide-metabolite BAM (2,6-dichlorobenzoamide). At regional scale, with the combination of a ten-meter-deep vadose zone and coarse texture, the observed concentrations could be described by the model without assuming preferential flow. A sensitivity analysis revealed that hydraulic conductivity in the aquifer and infiltration rate accounted for almost half of the model uncertainty. The calibrated model was applied to optimize the location of extraction wells for remediation, which were used to validate the predictive modeling. Running a worst-case scenario, the model showed that the establishment of two remediation wells would clean the aquifer in four years, compared to nine years without them. Further development of the model would require additional field measurements in order to improve the description of macrodispersion in deep, sandy vadose zones. We also suggest that future research should focus on characterization of the variability of hydraulic conductivity and its effect on contaminant transport in eskers.

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“…Clausen et al, 2004;Sprankle et al, 1975;Tuxen et al, 2000), controlled fieldscale experiments exploring the rate and pathways of transport (e.g. Boesten and van der Pas, 2000;Funari et al, 1998) and regional and national monitoring programmes comparing the degree and character of contamination between different types of catchments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Statistical screening for descriptive parameters for pesticide occurrence in a shallow groundwater catchment

Åkesson¹,

Sparrenbom²,

Carlsson³

et al. 2013

Journal of Hydrology

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. We have assessed the ability of a range of pesticide, site and climate parameters to discriminate between detected and non-detected pesticides as observed by long-term monitoring data of pesticide use and groundwater occurrence in a small catchment in southern Sweden. Of seventeen investigated parameters, six demonstrated such an ability: dosage applied, the Henry's Law Constant (HLC), the octanolwater partitioning coefficient (log P ow ), the amount of precipitation the week before application, the amount of precipitation the month after application, and the substance degradation potential (DT 50 ). The apparent influence of the investigated parameters on pesticide occurrence in groundwater, and their apparent suitability as descriptive parameters in terms of assessment of related risks, is accordingly discussed. We conclude that knowledge of actual pesticide use appear fundamental for risk assessment of groundwater contamination potential. We further suggest that chemical property-parameters of specific pesticides, although clearly valuable, should be applied in groundwater contamination risk assessments with care. If site-specific values are unattainable, tabular values of log P ow , HLC and water solubility (W s ) are demonstrated to exhibit a superior explanatory ability than those of substance adsorption potential (K oc ) and DT 50 which, in the latter case, is shown to be able to lead to misleading conclusions on actual risks.The demonstrated explanatory ability of precipitation both before and after application suggests that relatively greater precipitation amounts occur in relation to application of non-detected substances. Increased dilution and run-off as well as decreased soil matrix retainment and decreased top-soil cracking are potential explanations although higher-resolution monitoring records are needed in order to confirm these hypotheses.

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Sorption of the Herbicide Dichlobenil and the Metabolite 2,6-Dichlorobenzamide on Soils and Aquifer Sediments

Cited by 62 publications

References 30 publications

Deposition, persistence and turnover of pollutants: First results from the EU project AquaTerra for selected river basins and aquifers

Deposition, persistence and turnover of pollutants: First results from the EU project AquaTerra for selected river basins and aquifers

Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

Statistical screening for descriptive parameters for pesticide occurrence in a shallow groundwater catchment

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