IMPACT OF AC ELECTRIC FIELD NON-UNIFORMITY ON IMPEDANCE OF CONDUCTIVITY CELL

A. A. Mikhal, Z. L. Warsza

Abstract

AC impedance model of a liquid conductivity has been developed to assess the influence of magnetic vector potential. It has been proved that the field in a liquid conductor is quasi-static. Approximation error, even taken for very concentrated solutions (e.g. sea water), does not exceed 0.01 ppm. The calculation of resistance of the four-electrode cell is given with the account of Ampere's circuit law. Two types of errors are defined: DC error due to finite thickness of electrodes, and AC error due to presence of displacement currents when using an impedance model.

Keywords

measurement, electrolytic conductivity, electrical field, error

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IMEKO-WC-2015-TC24-460.pdf

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IMEKO TC

TC24 - Chemical Measurements

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