Abstract: A accurate, reliable method for correcting the background current in polarographic curves with digital computer has been developed. In this method, the fitting function proposed is composed of the multinomial B(E) =a/E + b + cE + dE², as a background function, and the polarographic peak function which is obtained by the combination of polarographic peak-current equation with revised Guassian function.By employing the nonlinear least square parameter estimation from the experimental curves, the Faradaic peak currents, peak potential and width of half-peak can be calculated without the need of the data of blank solution. This method has been applied to ACPand DPPfor subtracting the background current with satisfactory results.

Key words: Subtraction of background, Nonlinear least square parameter estimation, Polarography