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The Potentiometric Estimation of Chloride in Water Extracts of Soils¹

ABSTRACT

The thermodynamic equation for the e.m.f. developed between Ag-AgCl electrodes in a cell with liquid junction is derived for a complex electrolyte system containing Cl. The equation is tested experimentally and a method devised to determine Cl in water extracts of soil. The range of the method, 5 x 10^-5M to 10^-2M Cl, is much more sensitive than either the electrometric, conductometric or the Volhard methods currently used in soil analysis.

¹ Department of Soil Science, University of Sydney, N.S.W.

² Senior Lecturer and Teaching Fellow in Soil Science, respectively. Financial support through a University Research Grant by the University of Sydney is acknowledged.

Received for publication May 3, 1968. Accepted for publication January 10, 1969.