New mathematical method for detection of the metal catalyzer traces on the modified electrodes surface

Abstract

R.R. Nigmatullin, I.A. Chelnokova, H.C. Budnikov, I.A. Gafiatova and L.G. Shaidarova

New mathematical approach for characterization of the measured voltammograms (VAGs) obtained for electrodes with catalytic response and modified by nanoparticles of gold (Au) and palladium (Pd) was applied. The cases with tracing concentrations of the electrodeposited catalyzer were considered, when the corresponding VAGs for the solutes containing catalyzer and background coincide practically with each other. Using the catalyzer electrode response of dopamine (DA) and new mathematical approach for description of the remnant current fluctuations, it was shown that becomes possible to extract a useful information from the measured VAGs because of increasing the limits of the signal/noise ratio. The fluctuations of the remnant currents are transformed into a specific “confidence tube” that is used for detection of the VAGs perturbations evoked by the presence of the analyte traces. Using the proposed mathematical method, it becomes possible to achieve the low boundary of the DA detection up to 10-8 M.

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