Pyrohydrolysis法を用いた地球化学標準試料のヨウ素の分析

抄録

Iodine is strongly partitioned to aqueous fluid and highly biophilic, resulting in enrichment in seawater and marine sediments, but depletion in mantle. This element can be a useful geochemical tracer for water and material recycling into the mantle at subduction zones. In environmental chemistry, iodine is an essential trace element in human diet which plays an important role in controlling the metabolism. Once radioiodine is ingested to human body, it is accumulated in the thyroid gland, which causes internal exposure. For safe management of radioactive materials in the environment, it is also crucial to understand the geochemical cycles of iodine. In this paper, various analytical methods of iodine in geochemical samples are introduced. Especially, detailed experimental conditions of the Pyrohydrolysis method, which is widely used for sample pretreatment method are described, and the analytical results of geochemical standard samples by this method are compared with those by other methods.