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An investigation has been made of the chemical forms assumed by I131 initially in the form of iodide ion at low concentration (the order of 10−7M) when it is oxidized under various conditions. Oxidation at room temperature in 1f sulfuric acid solution by dichromate ion or cerium(IV) results in the formation of I2 and three additional, unidentified, chemical fractions which are not readily exchangeable with I−, I2, or IO3−. Two of the unidentified fractions are extracted from aqueous sulfuric acid solution by organic solvents, one fraction being converted by aqueous sodium hydroxide to water-soluble forms exchangeable with I2. At least some of the unidentified fractions probably are the products of reactions between trace impurities, molecular or colloidal, and iodine in an oxidized reactive form such as HIO. These unidentified fractions are quite inert toward oxidation and reduction. When iodide ion at low concentration is treated with a hot sulfuric acid solution of cerium(IV), the principal product is IO3−, or a species readily exchangeable with IO3−. The IO3− formed in this way is readily reduced at room temperature to I− by a sulfuric acid solution of iron (II).

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The Subcommittee Foreword on Radiochemistryisone of a number of subcommitteesworking under the Committee on Nuclear Science of the National Research Council. Itsmembers represent government, industrial, and universitylaboratories in the areas of nuclearchemistry and analytical chemist~. The Subcommittee has concerned itself with those areasof nuclearsciencewhich involve the chemist, such es the collectionand distribution of radiochemical procedures,the radiochemical purity of reagents,radiochemistryin environmental scienceand in nuclear medicine,and the roleof radiochemistry incollege and universi~programs. This series of monographs has grown out of the need for compilationsof radiochemiud information, procedures, and techniques. The Subcommittee has endeavored to pr-ent a series that will be of maximum use to the working scientist. Each monograph presentspertinent informationrequiredfor radiochemical work with an individual element or with a specialized technique. Expertsinthe particular rediochemical techniquehave writtenthe monographs, The Energy Researchand Development Administration has sponsoredthe printing of the series, The Subcommittee isconfidentthesepublications willbe usefulnot only to rediochemists but alsoto research workers inotherfields such as physics, biochemistry, or medicinewho wish to use radiochemical techniquesto solvespecific problems.