Fig. 5
Cr(VI) breakthrough curves in GRSO4 amended packed sand columns as a function of inlet solution pH: 4.5, 7.0 and 9.5 ([(Cr(VI)0] = 0.5 mM, flow rate = 1 ml/min). The dashed lines help to identify the breakthrough (C/C0 = 0.05) and exhaustion (C/C0 = 0.9) points on each curve