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
Geological Survey of Denmark and Greenland, Department of Geochemistry, DK-1350 Copenhagen K, Denmark.
Environ Pollut. 2008 Dec;156(3):794-802. doi: 10.1016/j.envpol.2008.06.002. Epub 2008 Jul 21.
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.
在丹麦冰水沉积平原一条28公里长的样带沿线，通过对包气带中15个单独钻孔采集的75个土壤样本进行分析，测定了农药的矿化作用和吸附情况。苯氧基乙酸类除草剂MCPA在表层土壤和大多数亚表层土壤中的矿化作用都很强，而嗪草酮和甲基三嗪胺的矿化作用一直较弱。结果表明，表层土壤中MCPA和嗪草酮的吸附作用与土壤有机质和pH值有关。表层土壤中甲基三嗪胺的吸附作用与黏土呈正相关，与土壤pH值呈负相关。草甘膦在亚表层土壤中的吸附作用也很强。对2米深处MCPA、嗪草酮和甲基三嗪胺浓度进行的一维MACRO模型计算表明，在所有测试剖面中，地下水中MCPA和甲基三嗪胺的平均浓度均低于0.1微克/升的管理限值，而嗪草酮总是超过0.1微克/升的阈值。
