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Stoffhaushaltsuntersuchungen in saarlaendischen Waldoekosystemen: Untersuchung der Stofffluesse an neun Depositionsmessflaechen in saarlaendischen Laubwaldoekosystemen

Seit 1989 werden fortlaufend monatlich Wasserproben der Kompartimente Freilandniederschlag, Kronentraufe, Stammabfluss, sowie Bodenwasser aus 3 Tiefenstufen gesammelt und analysiert. Es werden die Parameter pH, Leitfaehigkeit, sowie die Gehalte an oekosystemrelevanten Anionen und Kationen bestimmt. Die Stofffluesse werden bilanziert, critical loads errechnet sowie eine Gefaehrdungsabschaetzung vorgenommen. Im Rahmen des Level II - Programms werden seit 1995 auch Blattprobentnommen und analysiert.

Carriers of Vital and Detrimental Compounds in Environmental Compartments: Request for Funding of Coordination and System Analysis (nature, behaviour and role)

Man-made pollution of the environment is mainly due to inputs of pollutants and their transport in the geosphere, to storage and transformation by biological and chemical processes. The evaluation, prevention and clean up of pollution needs a thorough understanding of the concerned natural processes. The study of biogeochemical cycles in the environment is therefore one of the main topics of natural sciences in environmental research. The Swiss National Foundation for Scientific research started at the beginning of 1994 a new coordinated research program on biogeochemical cycles. The main goal of this Module 2 of the Priority Program Environment is the creation of a Swiss multidisciplinary network in the field of biogeochemical cycles, allowing as many research groups as possible to participate. The purpose of this common program is to investigate qualitatively and quantitatively the role of carriers on the fluxes of vital and detrimental compounds inside compartments and at the compartment boundaries: air, soil, sediments, surface water, subsurface and ground water. During 1994-1995, research will be focused in particular on sub micron colloids which are very little known. Leading Questions: What are the macroscopic processes of contaminant transport in complex natural environments (system analysis)? Occurence and properties of colloidal carriers in the air, the soil and the water? Mobility of colloidal carriers of contaminants? Implications for the contaminant transport (sorption, desorption, transformation)? Methods of sampling, preparation, analysis?

In-Situ-Quantifizierung von N2O (Lachgas)-Emissionen aus den verschiedenen Kompartimenten einer kommunalen Klaeranlage

In verschiedenen Abwasserreinigungskompartimenten (Belebungsbecken, Nitrifikations-/Denitrifikationsbecken, Nachklaerbecken) wird die Lachgasemission In-Situ aufgefangen, am Molekularsieb sorbiert und mittels GC im Labor quantifiziert. Kausale Zusammenhaenge mit den chemisch-physikalischen Wassereigenschaften werden geprueft und in Modellsystemen zu klaeren versucht.

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