Impedance characteristics of inorganic precipitate membranes

Department of Chemistry, Narain P.G. College, Shikohabad-205 135, Uttar Pradesh, India Manuscript received 8 September 2009, revised 21 January 2010, accepted 8 February 2010 The impedance characteristics or parchment supported lead sulphide, copper sulphide and complex lead-copper sulphide inorganic precipitate membranes have been analysed in order to understand the mechanism or ionic diffusion through biomembranes. The electrical resistance (Rx ) and capacitance (Cx) have been measured at different electrolyte concentrations and oscillator frequencies. Impedance values follow the theoretical predictions at high frequency, but at lower frequencies, there is a marked deviation from the ideal behaviour probably due to roughness and non homogeneity or the membrane used in this investigation