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(a) Calibration curve for oxalate determination with Si-Ti/ECR (λ 570 nm, pH 3.0, m/V = 0.10 g/ 5.0 mL, time of contact is 15 min), standard deviations for absorbance are given (n = 3); (b) The dependence of relative standard deviation of concentration of the oxalate found (RSD) on the concentration of the oxalate added (n = 3).
