Voltage fluctuations were measured across a polyvinylchloride (PVC)-membrane, acting as a constraint between two identical aqueous salt solutions. Membranes with de-resistances between about 2 and 10 megohms. cm2 were studied in solutions of KCl between 0.01 and 0.10 moles per liter.
Positive and negative currents between 10 and 100 nanoamps per square centimeter of membrane were passed. The noise was measured in the frequency range between 1.5 and 150 hertz. The spectral density of the noise power, in excess of that measured at equilibrium, was found to be proportional to the mean power being dissipated in the membrane, and inversely proportional to frequency.
Key wordsFrequency Analysis Membrane Noise
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