Fig. 4From: Determination of some heavy metals from aqueous solutions using modified Amberlite XAD-4 resin by selective solid-phase extractionEffect of initial metal concentration on the recovery of Pb(II) and Cd(II) by modified Amberlite XAD-4 resin (adsorbent amount: 0.2, pH:5, flow rate: 2.5Â mL/min)Back to article page