Topic
Iodine
About: Iodine is a research topic. Over the lifetime, 8936 publications have been published within this topic receiving 139981 citations. The topic is also known as: I & element 53.
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01 May 1992
TL;DR: In this paper, the authors found that the concentration of iodide was inversely related to that of iodate with a ratio of about −1 suggesting that the in situ reduction of iodates to iodide may play an important role in determining the distribution and speciation of iodine in these waters.
Abstract: The hydrographic front that separates the turbid inner shelf water from the “clearer” midshelf water on the southeastern U.S. continental shelf is accompanied by dramatic changes in the speciation of iodine. The total iodine to salinity ratio, or specific iodine, in the inner shelf was slightly lower, usually about 10% lower, than that in the midshelf, which was in turn slightly lower than those observed in the open oceans. This suggests that the efficiency for the removal of dissolved iodine to the particulate phase may increase progressively from the open ocean to the midshelf water to the inner shelf water. On the other hand, the average concentration of iodate increased by a factor of about three from the inner shelf to the midshelf water while the concentration of iodide decreased by about 30%. Above a concentration of iodate of about 0.05 μM, the concentration of iodide was inversely related to that of iodate with a ratio of about −1 suggesting that the in situ reduction of iodate to iodide may play an important role in determining the distribution and speciation of iodine in these waters. The relationship between the concentration ratio of iodate to iodide and the concentration of nitrate plus nitrite also falls into a definable pattern. Waters with high concentration ratios of iodate to iodide (>0.5) were found mostly when the concentration of nitrate plus nitrite fell below 0.5 μM. Above this concentration of nitrate plus nitrite, the iodate to iodide ratio was almost invariably below 0.5.
45 citations
TL;DR: The results show insignificant change in (129)I and (127)I speciation and suggest that reduction of iodate and oxidation of iodide in Skagerrak and Kattegat may be a slow process, and the positive correlation between salinity and iodide and iodate (both isotopes) may reflect effective control ofSkagerrak water mass on iodine distribution in surface water of the Baltic Sea.
45 citations
TL;DR: In this article, the sulphur(II) compounds that rapidly induce the iodine/azide reaction were determined by injection of 10-μl samples into an iodized solution at a flow rate of 1.4 ml min−1.
45 citations
TL;DR: It is concluded that thyroglobulin is a very efficient thyroid hormone-forming protein and that the native conformation of the protein is necessary for optimal formation of thyroid hormone.
45 citations
TL;DR: In this article, the authors investigated the early stages of the title reaction in the temperature range of 494-545 K and found that the initial rates were consistent with an iodine atom abstraction chain mechanism, and the bond dissociation energy D(SiH3H) = 378 ± 5 kJ/mol (90 kcal/mol).
Abstract: The title reaction has been investigated in the temperature range of 494–545 K. During the early stages of reaction the only observed products were silyl iodide and hydrogen iodide. Initial rates were found to obey the rate law
over a wide range of initial iodine and monosilane pressures. Secondary reactions, most probably of SiH3I with I2, became more important as the reaction progressed. However, provided [SiH4]0/[I2]0 > 20, these secondary processes had a negligible effect on the kinetics, and an integrated rate expression could be used. These kinetics are consistent with an iodine atom abstraction chain mechanism, and for the step
has been deduced. From this the bond dissociation energy D(SiH3H) = 378 ± 5 kJ/mol (90 kcal/mol) is obtained. The kinetic and thermochemical implications of this value, especially to the pyrolysis of monosilane, are discussed.
45 citations