Variation of MCPA, metribuzine, methyltriazine-amine and glyphosate degradation, sorption, mineralization and leaching in different soil horizons |
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Authors: | Jacobsen Carsten S van der Keur Peter Iversen Bo V Rosenberg Per Barlebo Heidi C Torp Søren Vosgerau Henrik Juhler René K Ernstsen Vibeke Rasmussen Jim Brinch Ulla Catrine Jacobsen Ole Hørbye |
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Institution: | a Geological Survey of Denmark and Greenland, Department of Geochemistry, DK-1350 Copenhagen K, Denmark b University of Copenhagen, Department of Natural Sciences, DK-1958 Frederiksberg C, Denmark c Geological Survey of Denmark and Greenland, Department of Hydrology, DK-1350 Copenhagen K, Denmark d University of Aarhus, Danish Institute of Agricultural Sciences, Department of Agroecology, Research Centre Foulum, DK-8830 Tjele, Denmark e Geological Survey of Denmark and Greenland, Department of Quaternary Geology, DK-1350 Copenhagen K, Denmark |
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Abstract: | Pesticide mineralization and sorption were determined in 75 soil samples from 15 individually drilled holes through the vadose zone along a 28 km long transect of the Danish outwash plain. Mineralization of the phenoxyacetic acid herbicide MCPA was high both in topsoils and in most subsoils, while metribuzine and methyltriazine-amine was always low. Organic matter and soil pH was shown to be responsible for sorption of MCPA and metribuzine in the topsoils. The sorption of methyltriazine-amine in topsoil was positively correlated with clay and negatively correlated with the pH of the soil. Sorption of glyphosate was tested also high in the subsoils. One-dimensional MACRO modeling of the concentration of MCPA, metribuzine and methyltriazine-amine at 2 m depth calculated that the average concentration of MCPA and methyltriazine-amine in the groundwater was below the administrative limit of 0.1 μg/l in all tested profiles while metribuzine always exceeded the 0.1 μg/l threshold value. |
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Keywords: | Vadose zone Groundwater contamination Herbicides MACRO modeling Spatial variation |
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