Improved high-frequency permittivity detector for the chromatography of alcohols and others polar species

Simple contactless cells with planar or tubular electrodes have been designed for measurement of the permittivity of solutions. The cells, connected to an integrated circuit of astable multivibrator, respond primarily to the capacitance component of the cell impedance, the multivibrator frequency depends in a defined manner on the solution permittivity and is readily used as the analytical signal in determinations of the ratios of components in binary liquid mixtures; water solution of methanol, ethanol and dioxane have been tested. The response of the cell with planar electrodes satisfies well the simple theoretical model and both the cells provide results with a sufficient sensitivity, a low LOD value (units of %vol) and a good precision (around 1%rel). The cell simplicity, small dimensions, long-term stability and the possibility of powering them from a battery make them suitable for hand-held meters. As an example of application in practice, the content of ethanol was determined in the car fuel petrol.

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Determination of nanomole amounts of sulphur dioxide in air by flow-injecton conductimetry with on-line preconcentration

Gács¹,

Ferraroli²

1992

Analytica Chimica Acta

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Improved high-frequency permittivity detector for the chromatography of alcohols and others polar species

Cited by 13 publications

References 7 publications

Analytical methods for alcohols, phenols, ethers and peroxides

Analytical methods for alcohols, phenols, ethers and peroxides

A Contactless Impedance Probe for Simple and Rapid Determination of the Ratio of Liquids with Different Permittivities in Binary Mixtures

Determination of nanomole amounts of sulphur dioxide in air by flow-injecton conductimetry with on-line preconcentration

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