Study of Electrical Equivalent Model of the PMMA Coated Probe Dipped in Milk and Milk Adulterated with Urea

The aim of this work is to study the impedance characteristics at the electrode-electrolyte interface of the PMMA coated probe dipped in milk and milk adulterated with different amount of urea and to propose an electrical equivalent circuit model for each adulteration using curve fitting program. The modelings of the probe with lumped parameters as well as distributed elements are obtained using LEVMW software and the best-fit model is estimated. The analytical expression of impedance is derived for the estimated electrical equivalent circuit and simulated using MATLAB. Finally the impedance value obtained by simulation is compared with experimental value obtained from LCR meter.