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The oxidation behavior of triiodide ions (I3-) in iodine solution in contact with 1-2vol% NO, gas was examined in the range from room temperature to 80°C.Upon contact with 2~0 1 % NO, gas, Is-ions in the solution disappeared within 1 h, and were replaced by iodine molecules (I,) in increasing concentration. A similar suppression of Is-ions was observed also with a starting liquid phase of concentrated 13-solution. This behavior of I,-and 1-ions is attributed to the oxidation of these ions in the solution into l2 molecules by HNO, and HNO, formed by the reaction between NOz-contained in the NO, gas-and water. The above oxidation reactions set in when the HN03 concentration exceeds 1~. Beyond 1 0~ HNO,, the Iz molecules forming part of the 1, -molecular structure, appear to be further oxidized into lo3-.The oxidation of 1, -in I-aqueous solution in contact with continuously supplied 1~0 1 % NO, is considered to be brought about in the initial stage by HNO,, and in the succeeding stage by HNO3 after its concentration exceeds a threshold point around 1~.

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