Stickstoffumsatz in Boden und Grundwasser bei unterschiedlicher Nutzung Teilprojekt 2: Extensivierung der Bodennutzung

An investigation in the drinking water catchment area of the town Augsburg (Bavaria) revealed that an effective contribution to the sanitation of a nitrate loaded surface-near groundwater can be achieved by converting the soil into permanent grassland. Under the special conditions of the investigated area, namely permeable soil, small distances of fields, high velocity and intensive intermixing of groundwater flow, the conversion into grassland assures quick sanitation effects. For nitrogen removal the grass has to be cut and removed at least once every year. A shut down of floor spaces without any harvest removal, as proposed by EC plans, can not be approved from the point of view of the economics of water supply and distributionSIGLEAvailable from TIB Hannover: F93B1342 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Hybrid sol gel coating: A solution to prevent interactions between plasticized poly(vinyl chloride) and injectable drugs?

International audienceDuring the infusion of drugs with medical devices in plasticized poly(vinyl chloride) (PVC) release of plasticizers in the injectable solution and/or sorption of drugs on PVC may occur. Thus, patient safety and/or effectiveness of his therapy may be altered. In this study, we assessed the efficiency of a sol gel hybrid coating in preventing plasticizers' release (di-(2-ethylhexyl) phthal-ate (DEHP)) from PVC matrix and drug sorption into PVC. Remaining concentrations of drugs and plasticizer's concentration released after migration tests were assessed by liquid chromatography. Migration processes were followed by Fourier Transform Infra-red – Attenuated Total Reflectance (FTIR-ATR) spectroscopy and PVC surface changes were characterized by scanning electron microscopy (SEM). An evaluation of the mechanical properties of both uncoated and coated polymer was done. The hybrid coating protects PVC from plasticizers leaching. Sorption of drugs tested is also limited. However, the protection against plasticized PVC interactions isn't optimal, probably due to a degradation of the layer, as shown on SEM microphotographs. Furthermore improvements might provide an efficient barrier to advert risks impaired to PVC interactions, to provide patient care safet