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Electrochemical Measurements on Milk with Cation and Anion Sensitive Membrane Electrodes¹

Department of Agricultural Chemistry, University of Missouri, Columbia

ABSTRACT

For many years there has been considerable interest in the ionic atmosphere of milk, its distribution into different phases, and its effect upon the stability of the colloidal systems in milk and on the keeping qualities of milk and of milk products.

The purpose of the investigation reported here was to determine if possible the normal over-all cationic and anionic activity of milk and to investigate the possible distribution of the various cations common to milk.

Three types of ion sensitive membrane electrodes have been used in this work and are as follows: Ion exchange resin membranes which are sensitive to all the cations present, clay membranes which are sensitive only to monovalent cations, and membranes prepared from anion exchange resins which are sensitive to all the anions. A previous paper by Affsprung et al. (1) reports on the preparation, characterization, and electrochemical behavior of the ion-exchange membrane electrodes that were used in this report.

¹ This paper reports research sponsored by the Quartermaster Food and Container Institute for the Armed Forces and has been assigned No. 512 in the series of papers approved for publication. The views or conclusions contained in this report are those of the author. They are not to be construed as necessarily reflecting the views or indorsement of the Department of Defense.

Journal Series Paper No. 1475 approved by the Director of the Missouri Agricultural Experiment Station.

² The experimental data were taken from a thesis presented by H. E. Affsprung to the Graduate School, University of Missouri, in partial fulfillment of the requirements for the degree of Doctor of Philosophy, 1954. Present address, New York State College for Teachers, Albany, N. Y.