Multitracer-Versuch im kontaminierten Grundwasser des Testfeldes Süd
2002
A natural gradient multitracer-experiment (fluorescein, eosin, naphthionate, bromide) was performed at an experimental site with contaminated groundwater. The break-through curves were evaluated by fitting an analytical solution of the transport equation to the breakthrough curves, different calculation methods based on the tracer arrival times, and with numerical transport simulations. The observed transport direction differed markedly from the expected direction based on equipotential lines. The method of temporal moments proved to be best suited to describe the transport velocity. Transverse dispersivites could not be evaluated satisfactorily, even though numerous observation wells existed. The interactions of the tracers and nonaqueous phase liquids (octanol, tar oil, lubrication oil) were investigated with laboratory experiments. None of the tracers was affected. Fluorescein and eosin could be applied successfully even when nonaqueous phase liquids were present, but the application of naphthionate suffered from high background fluorescence.
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