To develop a convenient method for sensitive and selective determination of Ce3＋ in aqueous phase with complicated matrices, a carbon paste electrode（CPE） modified with ion imprinted polymers（IIPs） were fabricated. The polymers were prepared by precipitation polymerization using Ce3＋ as template, allyl phenoxyacetate（APA） as monomer, ethylene glycol dimethacrylate（EGDMA） as crosslinker and azobisisobutyronitrile（AIBN） as initiator under the molar ratio of Ce3＋, APA and EGDMA as 1：4：40, respectively. Ce3＋ was detected directly by differential pulse adsorptive stripping voltammetry（DPASV） and its oxidation peak appears at about 0.93 V. All parameters affecting the sensor＇s response are optimized and a calibration curve is plotted at a linear range of 1.0 × 10^（-6）-1.0 x 10^（-5） mol/L and 1.0×10^（-5）-2.0 × 10^（-4）mol/L with the detection limit of 1.5 × 10^（-7） mol/L. All other rare earth ions have no interference with the determination of Ce^（3＋） even at a concentration 500 times higher than that of Ce^（3＋）.This sensor was successfully applied to determination of Ce^（3＋） in two catalyst sample solutions with RSD≤3.3%（n = 5）and recoveries in the range of 99.2%-106.5% at our optimal conditions.
Jin ChenHuiping BaiJieren XiaXiaolan LiuYanxiong LiuQiu'e Cao
