The detection of Pb2+ in solution using bare magnetoelastic resonator

In this paper, a simple and low cost method for determination of Pb2+ in solution, using bare Metglas alloy 2826MB as the resonator, is reported. Based on the replacement reaction mechanism of the Pb2+ in the solution with Fe and Ni in the Metglas 2826MB ribbon surface, the Pb replaced on the resonator can increase the mass load of the resonator and decrease the resonant frequency of the resonator. Hence, the Pb2+ concentration in solution can be determined by the resonant frequency shift of the ME resonator. The Energy Dispersive Spectrometer results of Pb, Fe, and Ni contents on the resonator's surface prove the reliability of this method. Furthermore, the experimental results show that the resonant frequency shift rate of the resonator decreases when the Pb2+ concentration declines. The sensitivity of the resonator for Pb2+ detection is greatly related to its dimension. The resonator with smaller size has a better sensitivity. The resonant frequency shift of the resonator with dimension of 3mm x 6mm x 30 mu m is linearly proportional to the Pb2+ concentration. The sensitivity of the resonator for Pb( NO3)(2) detection is about 24 Hz/mg ml(-1), and the resonator has a better stability and reproducibility for Pb2+ detection with low concentration. (C) 2016 AIP Publishing LLC.