Variation of MCPA, metribuzine, methyltriazine-amine and glyphosate degradation, sorption, mineralization and leaching in different soil horizons.
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.
Jacobsen
Carsten S
CS
Geological Survey of Denmark and Greenland, Department of Geochemistry, DK-1350 Copenhagen K, Denmark. csj@geus.dk
van der Keur
Peter
P
Iversen
Bo V
BV
Rosenberg
Per
P
Barlebo
Heidi C
HC
Torp
Søren
S
Vosgerau
Henrik
H
Juhler
René K
RK
Ernstsen
Vibeke
V
Rasmussen
Jim
J
Brinch
Ulla Catrine
UC
Jacobsen
Ole Hørbye
OH
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
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