Description: Das Projekt "Aquatische Freiland Mesokosmosstudie mit Eisensilikatbreachsand und -steinen aus der Kupfergewinnung" wird vom Umweltbundesamt gefördert und von Fraunhofer-Institut für Molekularbiologie und Angewandte Oekologie durchgeführt. Slag material from copper production (copper slag) is used since several decades as armour stones in channels, rivers and harbours in Germany. It consists mainly of iron silicate and silicates of aluminium and c silicates. However, because also metals like Cu, Zn, Pb, Ni and As are present in small amounts the potential hazard of metals leaching in to the water is discussed. Usually, the hazard of substances leaching into water is assessed in laboratory elution experiments with material broken into small pieces. However, these worst case conditions are not suitable for realistic assessments of the risks to populations in the field. Field monitoring suffers from the problem of many factors affecting environmental concentrations and their effects on populations and communities. We present an outdoor model ecosystem approach as an alternative which allows combining a controlled experimental approach with the opportunity to measure the effects of a stressor on the dynamics of population of many populations of different trophic levels under realistic exposure conditions. In order to analyse the heavy metal load of water, sediment and biota resulting from armourstones and its effects on algae, macrophytes, zooplankton and macroinvertebrates, different doses of armourstones were tested in 2 000 L enclosures placed in a large pond. Basanite armourstones were used to achieve the same total amount of stones in all enclosures. Metal concentrations and effects on the biocoenosis were followed over 1 year after introduction of the slag. Effects were statistically analysed on the population and community level. Cu, Ni, Zn, Mn and Fe concentration in the water increased, related to the amount of the introduced copper slag; e.g. the maximum Cu concentrations found at the highest treatment level (100 g stones / L) were 14 micro g Cu/L. In biota Cu concentration increased up to a factor of 5 compared to the controls while other metals showed usually no or a smaller increase in biota. No indication of biomagnification was found. At 100 g stones / L, effects on algae, macrophytes and insects over more than 8 weeks or at the end of the study could not be excluded. Up to 50 g stones / L no long-term or pronounced effects on the biocoenosis were observed. Thus, 50 g armour stones / L (1:20) are considered as the No Adverse Effect Concentration in this study.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Ökosystemansatz ? Aluminiumsilikat ? Populationsdynamik ? Insekt ? Aluminium ? Gerinne ? Schwermetallbelastung ? Wasserstraße ? Silikat ? Eisen ? Fluss ? Kupfer ? Makrophyten ? Material ? Asche ? Pflanzensamen ? Zooplankton ? Molekularbiologie ? Bundesrepublik Deutschland ? Teich ? Biomagnifikation ? Biozönose ? Extraktion ? Gewässergefährdung ? Kupferbergbau ? Schlacke ? Sedimentanalyse ? Wirkung ? Metall ? Hafen ? Wasseraufbereitung ? Risikoanalyse ? Exposition ? Studie ? Trophiegrad ? Bewässerung ? Kapselung ? Sediment ? Algen ? Dosis ? Wasser ? Stoff ? Wirkung ? Effektkonzentration ? Auslaugung ? Gefährdungspotenzial ? Forschungseinrichtung ? Population ? Gestein ? Maßnahme ? Bevölkerung ? Risikobewertung ? Produktion ? STATISTISCH ? VERGLEICHEN ? GEMEINSCHAFT ? VERHAELTNIS ? Vermehrung ? SONSTIG ? GEGENWART ? HOECHSTGEHALT ? BETRAG ? Wassermenge ? BEWERTEN ? Schotter ? VERWANDT ? UNGUENSTIGSTER FALL ? ERGEBNIS ? UNTER ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2008-05-01 - 2012-10-10
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