科研之友
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摘要
A novel electrochemical method based on dehydroabietylamine schifT base(DBS) and multi-walled carbon nano-tubes(MWCNTs) composite modified glassy carbon electrode was presented for determination of Pb2+. The electrochemical behaviors of Pb2+ on the modified electrode were investigated by cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV). The results showed that under the optimized conditions including 0.2 mol/L NaAc-HAc used as supporting buffer (pH 5. 5), 1. 1 V of accumulating potential, 250 s of accumulating time, the oxidation peak current was proportional to Pb2+ concentration in the range between 1 x10(-8) mol/L and 1 x 10(-6) mol/L with the linear regression equation as I(mu A)= 6. 6173c(mu mol/L) +O. 2597(R = O. 9971) and the detection limit as 5. 0 X 10(-9) mol/L (S/N= 3). The proposed sensor was successfully employed to determine Pb2+ in real samples with satisfactory results. In addition, this method showed the advantages of simple operation, short assay time, good accuracy, satisfactory efficiency and good selectivity for determination of low concentration lead in water samples.
