Title of article :
Variation of MCPA, metribuzine, methyltriazine-amine and glyphosate degradation, sorption, mineralization and leaching in different soil horizons
Carsten S. Jacobsen، نويسنده , , Peter van der Keur، نويسنده , , Bo V. Iversen، نويسنده , , Per Rosenberg، نويسنده , , Heidi C. Barlebo، نويسنده , , S?ren Torp، نويسنده , , Henrik Vosgerau، نويسنده , , Réne K. Juhler، نويسنده , , Vibeke Ernstsen، نويسنده , , Jim Rasmussen، نويسنده , , Ulla Catrine Brinch، نويسنده , , Ole H?rbye Jacobsen، نويسنده ,
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.