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Abstract: A novel molecularly imprinted polymer (MIP) electrochemiluminescence (MIP-ECL) sensor was developed for the highly sensitive and selective determination of ultra-trace levels of Ni2+. The complex Ni2+-dimethylglyoxime (Ni-DMG) was chosen as the template molecule to construct the MIP and then acted as a mimetic enzyme to catalyse the oxidisation of luminol to enhance the ECL signal. When the imprinted cavities were occupied by Ni-DMG in the rebinding process, the ECL intensities produced by the luminol-H2O2 ECL system on the MIP-modified electrode surface increased with increased concentration of the Ni-DMG complex. The highly sensitive determination of Ni2+ was achieved through a catalytic reaction. This technique could be used for the quantitative analysis of Ni2+ with concentrations from 3.0 x 10-12 mol L-1 to 6.0 x 10-9 mol L-1. The detection limit was 1.01 x 10-12 mol L-1, which is much lower than that reported previously. In addition, the allowable amounts of interference ions in the MIP-ECL sensor were higher than that in other common molecularly imprinted sensors because of its excellent recognition of 3D cavity-to-complex molecules and ligand-to-metal ions. This method was successfully used to determine Ni2+ in real samples, such as apples, carrots and grapes, and has been proven feasible for practical applications
Template and target information: nickel ion, Ni(II)