IODINE ASSAY IN COW MILK - INDUSTRIAL TREATMENTS AND IODINE CONCENTRATION

A kinetic method of analysis based on the Sandell-Kolthoff catalytic r eaction is used for the determination of the iodine content in cows' m ilk. Before being putting up for sale, cows' milk undergoes several in dustrial treatments: homogenization, pasteurization, ultra high temper ature treatment and progressive skimming. The aim of this paper is to assess the effect of the official sanitary treatment and of various th ermal precesses on milk iodine content. Special care is devoted to sam pling in order to analyze samples deriving from the same initial pool. The analytical method is simple and sensitive. Recovery (92 +/- 3%), repeatability (1.6%) and limit of detection (20 mu g/l) are reported. A calibration curve in logarithmic form is proposed.