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Conversion of Freundlich Adsorption K Values to the Mole Fraction Format and the Use of S_Y Values to Express Relative Adsorption of Pesticides¹

ABSTRACT

Anomalies in the Freundlich isotherm equation prevent the simple conversion of K values to a common set of units for assessment of relative adsorption. Although there is a straightforward way to properly convert the units of K values, serious extrapolation errors can result because, in the new set of units, the K value may be evaluated considerably outside the concentration data range. In the mole fraction format, concentration is reported as a mole fraction, and adsorption as mol g^–1, giving units of mol g^–1 for K. In this format, K loses any practical meaning since it is evaluated at log Z = 0, Z = 1. An improved and more flexible method of reporting relative adsorption using S_Y values is presented as well as a procedure to convert existing data to this format.

¹ Contribution from the Research Centre, Agriculture Canada, University Sub Post Office, London, Ontario, Canada N6A 5B7.

² Research Scientist, Research Centre, Agriculture Canada, London, Ontario Canada N6A 5B7.

Received for publication April 21, 1981. Accepted for publication March 18, 1982.

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