title: Variation of MCPA, metribuzine, methyltriazine-amine and glyphosate degradation, sorption, mineralization and leaching in different soil horizons.
abstract: Pesticide mineralization and sorption were determined in 75 soil samples from 15 individually drilled holes through the vadose zone along a 28km 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 2m depth calculated that the average concentration of MCPA and methyltriazine-amine in the groundwater was below the administrative limit of 0.1mug/l in all tested profiles while metribuzine always exceeded the 0.1mug/l threshold value.
authors.affiliation: Geological Survey of Denmark and Greenland, Department of Geochemistry, DK-1350 Copenhagen K, Denmark. csj@geus.dk
authors.forename: Carsten S
authors.initials: CS
authors.lastname: Jacobsen
authors.forename: Peter
authors.initials: P
authors.lastname: van der Keur
authors.forename: Bo V
authors.initials: BV
authors.lastname: Iversen
authors.forename: Per
authors.initials: P
authors.lastname: Rosenberg
authors.forename: Heidi C
authors.initials: HC
authors.lastname: Barlebo
authors.forename: Søren
authors.initials: S
authors.lastname: Torp
authors.forename: Henrik
authors.initials: H
authors.lastname: Vosgerau
authors.forename: René K
authors.initials: RK
authors.lastname: Juhler
authors.forename: Vibeke
authors.initials: V
authors.lastname: Ernstsen
authors.forename: Jim
authors.initials: J
authors.lastname: Rasmussen
authors.forename: Ulla Catrine
authors.initials: UC
authors.lastname: Brinch
authors.forename: Ole Hørbye
authors.initials: OH
authors.lastname: Jacobsen
mesh_terms: D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000032:analysis*; D000327:Adsorption; D000538:Aluminum Silicates; D001673:Biodegradation, Environmental; D000077215:Clay; D003718:Denmark; D004784:Environmental Monitoring / Q000379:methods; D005998:Glycine / Q000031:analogs & derivatives / Q000032:analysis; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D015233:Models, Statistical; D010316:Particle Size; D052638:Particulate Matter; D045483:Rivers; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014227:Triazines / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis; D000097797:Glyphosate
chemical_list: D008456:2-Methyl-4-chlorophenoxyacetic Acid; D000538:Aluminum Silicates; D000077215:Clay; D005998:Glycine; D006540:Herbicides; D052638:Particulate Matter; D012987:Soil; D012989:Soil Pollutants; D014227:Triazines; D014874:Water Pollutants, Chemical; D000097797:Glyphosate; C533584:methyltriazine amine; C009235:metribuzin