Abstract
Since the Chernobyl accident, joint research on dietary intake of trace elements has been carried out with Ukrainian researchers from the viewpoint of radioecology, hygiene and nutrition science. Concerning high rates of thyroid abnormalities, dietary intake of iodine in this region was investigated and it was found to be remarkably lower than the recommended dietary allowance. Stable iodine, which is known as one of the essential elements, can be index of behavior of radionuclides in the environment. In this presentation, results of analysis of iodine and bromine in milk in Ukraine are reported.
Milk samples were freeze-dried followed by pyrohydrolysis for collecting iodine and bromine in the samples into alkaline solution. Concentrations of the elements were measured by ICP-MS. Detection limits of iodine and bromine were 0.2 and 1 ng/ml, respectively.
Arithmetic mean and standard deviation of iodine concentration in Ukrainian milk were 63 ±53μg/kg-dry. On the other hand, iodine concentration in Japanese milk was 134 ±36μg/kg-dry. Although iodine concentration in Ukrainian milk was largely scattering, its arithmetic mean was about one third of Japanese. Analysis of more number of samples is now proceeding.
