Transport of veterinary medicines from soils to groundwater

继续使用土柱和蒸渗仪研究兽药的流动性和沥滤，特别强调优先流。将对使用14 C标记磺胺嘧啶（SDZ）给药猪的猪浆进行施肥的蒸渗仪和使用14 C标记二氟沙星（DIF）给药猪的猪浆进行施肥的蒸渗仪进行破坏性取样，以获得兽药及其代谢物去向的物料平衡。土壤从破坏性取样的蒸渗仪在盆栽实验中使用，以测试的假设，结合SDZ（和DIF），包括转化产物可能成为通过植物根际的行动。土柱实验继续研究重复应用含有SDZ和命运的14 C-标记的羟基-磺胺嘧啶的泥浆的效果。利用土柱试验的结果，建立了SDZ在土壤中运移的数学模型。因此，吸附实验与土壤从不同的视野是强制性的，因为我们经历了意想不到的吸附行为。此外，我们将准备和进行中央围隔和现场实验。

Studies on the mobility and leaching of veterinary medicines with special emphasis on preferential flow using soil columns and lysimeters are continued. The lysimeters that were manured with pig slurry from pigs medicated with 14C labelled sulfadiazine (SDZ) and the lysimeters that were manured with pig slurry from pigs medicated with 14C labelled difloxacin (DIF) will be sampled destructively in order to obtain material balances on the fate of the veterinary medicines and their metabolites. Soil from the destructive sampling of the lysimeters is used in pot experiments to test the hypothesis that bonded SDZ (and DIF) including transformation products may become available through the action of the plant rhizosphere. Soil columns experiments are continued to study the effect of repeated application of slurry containing SDZ and the fate of 14C-labelled hydroxy-sulfadiazine. The knowledge from the soil column experiments is used to predict the transport of SDZ in soil with a numerical model. Therefore sorption experiments with soil from different horizons are mandatory as we experienced unexpected sorption behaviour. In addition we will prepare and conduct the central mesocosm and field experiment.