ABSTRACT
Eosine and especially Uranine usually are used in tracer experiments as conservative tracers. In many tracer tests they however have shown significant retardation. Starting from a negative tracer test in a bank infiltration test, batch partition experiments and column tests were performed for a aquifer material containing a high content of organic carbon (31.2 %). The FREUNDLICH-isotherms for Uranine and Eosine, done by batch experiments, show sorption coefficients from 10.2 (Uranine) and 102.3 (Eosine). The column experiments were carried out in a stainless steel-teflon-brass permeameter system. Breakthrough curves were obtained and the retardation factors Rf were evaluated by curve fitting, Rf ranged from 10 – 39.3 for Uranine and 40 – 214 for Eosine.
