Transport of veterinary medicines from soils to groundwater

继续研究兽药的流动性和淋溶性，特别强调使用土壤柱和渗滤仪的优先流动。用14C标记的磺胺嘧啶（SDZ）猪的猪浆施肥的溶痰仪和用14C标记的双氟沙星（DIF）猪的猪浆施肥的溶痰仪将进行破坏性取样，以获得兽药及其代谢物命运的物质平衡。从溶渗仪破坏性取样的土壤被用于盆栽实验，以检验包括转化产物在内的结合SDZ（和DIF）可能通过植物根际的作用而获得的假设。土柱实验继续研究了重复施用SDZ浆料的影响和14c标记羟基磺胺嘧啶的命运。利用土柱试验的知识，建立了土中SDZ运移的数值模型。因此，由于我们经历了意想不到的吸附行为，因此必须对不同层位的土壤进行吸附实验。此外，我们还将准备并进行中心中观和田间试验。

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.