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.

Photocatalyzed Production of Hydrogen and Iodine from Aqueous Solutions of Iodide Using Platinum Loaded TiO2 Powder.

Abstract: Hydrogen evolution and oxidation of iodide on photoirradiated Pt-loaded TiO2 powder were studied in the deaerated solutions containing iodide ions. These photocatalytic reactions have been considered to be difficult because the reaction is endothermic and reversible. However, we found that under some experimental conditions the reactions proceeded until the concentration of I3− ions reached a limiting level. The initial rate of the reactions and the limiting concentration of I3− ions in solution were enhanced as the pH of the solution decreased. In order to elucidate the pH dependence, the anodic current due to the oxidation of iodide ions on TiO2 film electrodes and the adsorptivity of iodide ions on TiO2 powder were measured. The results showed that the enhanced reactivity at low pH is due to the increased adsorptivity of iodide ions on TiO2. It was also found that the electric contact between platinum and TiO2 is important to make the reactions go forward.

Uptake of radioactive iodine by the normal and disordered thyroid gland in children; a preliminary report.

Abstract: Studies of the uptake of radioactive iodine by the normal and hyperfunctioning thyroid gland in adults have been published by Hamilton and Soley, Hertz, Roberts and Salter, (1, 2) and others. Hamilton, Soley, Reilly, and Eichorn have reported on iodine studies in a small series of cases of childhood hypothyroidism, including some with goiter (3). Most of their tests were made with eight-day iodine containing an appreciable admixture of stable iodine; with such material the apparent uptake is always much less than with a “carrier-free” preparation in which all the iodine is radioactive. Since the search for an unambiguous indicator of thyroid function in children, particularly in infants, still continues, the present study was undertaken in the hope of achieving this goal. Eight-day radioactive iodine (I131), carrier-free, was obtained from the cyclotron laboratory of the Massachusetts Institute of Technology in dilute solution of sodium iodide. The amount of the latter was so small as to be considered phy...

Characterization of iodide retention on Callovo-Oxfordian argillites and its influence on iodide migration

Abstract: Iodine-129 is commonly considered to belong to the largest contributors to the calculated impact on health associated with the long-term nuclear underground waste disposal. Its behaviour in Callovo-Oxfordian argillites, an argillaceous host rock studied by ANDRA, therefore must be fully characterized. Investigated cores have been extracted from a place outside the Meuse/Haute Marne underground laboratory. Thus, batch and through-diffusion experiments were performed to investigate iodide sorption and transport, on two different test samples. Batch experiments give evidence of a kinetically limited slight retention of iodide at low total iodine concentration. This sorption, dependent on the oxic/anoxic conditions, has been modelled with an initial quick reaction and a long-term steady loss of iodide from the solution. Through-diffusion experiments have confirmed this retention but to a lower extent than observed in batch experiments and differences were found between both samples. These differences have been explained by anionic exclusion, which potentially blocks sorption site access.