222Rn as a partitioning tracer to detect diesel fuel contamination in aquifers: laboratory study and field observations

Article Abstract:

The radioactive isotope 222Rn can be used as a partitioning tracer to detect aquifer contamination by non-aqueous-phase liquids, such as diesel fuel. The advantages of using the isotope include its already being present in aquifers and the need to only measure 222Rn activities once. However, use of 222Rn isotopes may also give false readings of contamination because the presence of a monitoring well weights saturation levels close to the well more strongly than levels far from the well.

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Distribution of trace elements associated with dissolved compounds (less than 0.45 micrometers - 1 nanometer) in freshwater using coupled (frontal cascade) ultrafiltration and chromatographic separations

Article Abstract:

Distribution coefficient (Kc) of trace elements in freshwater has been found to decrease as concentration increases indicating the so called 'particle concentration effect.' Kc of Co, Fe, Zn, Ag, Cd, and Cs were determined by size distribution of colloids and the affinity of colloidal organic matter for the trace elements that were in turn determined through coupled cascade ultrafiltration and chromatographic separations.

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Radon-222 as a groundwater tracer. A laboratory study

Article Abstract:

Radon-222 can be used as a radioactive tracer to measure residence times and velocity of groundwater. In a laboratory experiment, radon was used in an open-topped sand box to trace water flow. The method can be used in field studies to analyze the velocity and residence time of relatively slow groundwater through sandy aquifer.

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