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Fig. 9. (a) Observed (symbols) and model fitted (lines) tracer effluent concentrations involving the displacement of Br-, PFBA, and PIPES through the unsaturated horizontal core. Modeled Br- concentrations are shown with the model parameters provided in Table 5. Modeled PFBA and PIPES concentrations were omitted to improve clarity of figure. (b) Observed initial tracer breakthrough showing separation and crossover of tracers. (c) Observed tracer concentration during washout showing separation and crossover of tracers.
