Abstract
Tracers have been used since 1869 to establish hydraulic connections in the ground and to determine the velocity of ground-water flow. Some organic dyes, Sulforhodamine G Extra, Rhodamine WT and under certain pH conditions also Uranine, seem to be useful as tracers for investigating ground-water flow in fractures and channels (karst). As regards strong electrolytes, cations are mostly adsorbed in porous media. Tracers for studying ground-water flow in such aquifers must therefore be chosen from among anions and metal complexes. Thanks to the rapid development of analytical methods (atomic absorption, emission spectrography and neutron activation analysis) it is possible today to perform tracer tests using low concentrations of anions and complexes.
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