Fig. 3
Cr(VI) breakthrough curves in GRSO4 amended packed sand columns as a function of different inlet Cr(VI) concentrations (C0 = 0.125, 0.25, 0.5 and 1 mM; flow rate = 1 ml/min; pH 7.0). The tracer test was performed with 0.4 M NaNO3. The dashed lines help to identify the breakthrough (C/C0 = 0.05) and the exhaustion (C/C0 = 0.9) points on each curve