Application of the Multiple Linear Regression Method to Differential Pulse Polarography

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Abstract
The Multiple Linear Regression method has been used for treatment of the highly overlapped peaks obtained from the binary mixtures Cd-Ni and the ternary mixture Cd-Ni-Cu in KSCN 1 M and pH = 4.5 (Britton-Robinson buffer) by Differential Pulse Polarography. Metal concentrations were within the range of 6.8 to 33.2 μ.M for Cadmium and of 6.4 30.4 μM for Nickel and Copper. The obtained results prove that the hard multivariate calibration models such as Multiple Linear Regression can be applied in Differential Pulse Polarography when the baseline is subtracted; in addition, both the fitting parameters and relative errors are much better when the smoothed polarograms are used.