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HERO ID
4822173
Reference Type
Journal Article
Title
Modeling Subsurface Fate of S-Metolachlor and Metolachlor Ethane Sulfonic Acid in the Westliches Leibnitzer Feld Aquifer
Author(s)
Kupfersberger, H; Klammler, G; Schuhmann, A; Brueckner, L; Kah, M
Year
2018
Is Peer Reviewed?
1
Journal
Vadose Zone Journal
ISSN:
1539-1663
Volume
17
Issue
1
DOI
10.2136/vzj2017.01.0030
Web of Science Id
WOS:000439697100001
Abstract
Pesticides and their metabolites have been increasingly detected in groundwater bodies in southeastern Austria in recent years. The main objective of this study was to model the fate of the herbicide S-metolachlor (2-chloro-N-(2-ethyl-6-methylphenyl)-N-[(1S)-2-methoxy-l-methylethyllacetamide; SMET) and the main metabolite metolachlor ethane sulfonic acid (MESA) at the Westliches Leibnitzer Feld (WLF) aquifer. For this purpose, a modeling approach based on coupling the one-dimensional vadose zone model PEARL and the two-dimensional groundwater flow and solute transport model FEFLOW was developed. To calibrate the one-dimensional pesticide fate model, we used leachate concentrations of SMET and MESA from lysimeter experiments. Additionally, samples of representative soil types in the WLF aquifer were analyzed to infer SMET- and MESA-specific fate parameters (e.g., half-life DT50, Freundlich sorption coefficient K-foc), which were used for the PEARL model. The results show that using SMET fate parameters derived from the lysimeter data considerably improved the fit of the simulation results with the field observations compared with the application of standard laboratory-derived fate parameters accounting for soil type differences. Although locally an overestimation of the monitoring data prevailed, the description of the subsurface fate of pesticides will improve the interpretation of concentration data and the design of mitigation measures.
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IRIS
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1,2-Dibromo-3-chloropropane
Litsearch 2018
WOS
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