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Abstract: A 4-aminoazobenzene (4-AAB) molecularly imprinted polymer (MIP) film was synthesised on the surface of a pencil graphite electrode (PGE) through electropolymerisation technique. After removing the template molecular 4-AAB with ultrasonic clean, 4-AAB-MIP-PGE was obtained. Under interfacial potentiometry with double poles (IPDP), the factors influencing the performance of this electrode were studied and optimised. Based on the rebinding of MIP to template molecular, which resulted in the changing of the interfacial potential at the corresponding interface, an IPDP sensor for the selective determination of 4-AAB was prepared. By recording the zero current potential EZCP, where circuit current I was equal to zero in the I-E curve, the changing of interfacial potential of this sensor was monitored. With the concentrations of 4-AAB increasing, the I-E curve shifted positively. And, the zero current potential was linearly related with the logarithm of the 4-AAB concentration in the range from 0.197 to 197 μg L-1 with a detection limit of 0.135 μg L-1 (S/N = 3). The sensor was used to determine the concentration of 4-AAB in waste water samples with the recoveries from 98.8% to 103.0%
Template and target information: 4-aminoazobenzene
Author keywords: 4-aminoazobenzene, interfacial potentiometry with double poles, molecularly imprinted polymer, Electropolymerisation, Zero current potential