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An Indirect Method for the Estimation of the Iodine Content in Raw Milk

Cooperative Extension
Department of Food Science and Technology, University of California, Davis 95616

ABSTRACT

The measurement of iodine in milk by conventional chemical procedures is tedious and expensive. An ion selective electrode was evaluated in comparison to a microchemical method. Mean concentrations of iodine in a comparative study of 116 raw milk samples by the chemical method and ion selective electrode were 324 and 347 µg/kg. Mean concentrations of iodine in 63 market milks by the chemical method and ion selective electrode were 359 and 409 µg/kg milk. Correlations between methods were .95 and .87 for raw milk and market milk samples. The ion selective electrode can be used for monitoring iodine concentrations in raw milk but probably not in processed milk.