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Determination of Milk Minerals by Flame Photometry¹

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

A flame photometer technique suitable for single optical system instruments is described which gives excellent results for calcium, potassium and sodium in milk. The method consists essentially of determining the relative spectral intensity of the element in an unknown solution followed quickly by the determination of the intensity of the element in two standard solutions, one of slightly higher concentration, the other of slightly lower concentration than the unknown. The concentration of the unknown then is calculated by interpolation. The effects of extraneous ions upon the spectral intensity of the elements determined are minimized either by incorporating the influencing ions in the standard solutions at concentration levels similar to those found in the unknown solutions or by making appropriate predetermined numerical corrections.

¹ Taken in part from material presented in a thesis to the Graduate Faculty of the University of Illinois by Stephen J. Speck in partial fulfillment of the requirements for the degree of Master of Science.

² Present address: Dairy Departmen, University of Georgia, Athens