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(a) The effect of pH on ΔA = A0 − A200, where A0 is Si-Ti/ECR absorbance in absence of oxalate and A200 is Si-Ti/ECR absorbance in presence of 200 mg/L oxalate (λ 570 nm, time of contact is 15 min); (b) kinetics of the interaction of Si-Ti/ECR with 200 mg/L oxalate solution (λ 570 nm, pH 3.0). m/V = 0.10 g/ 5.0 mL.
