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Abstract
The oxidation behavior of triiodide ions I3-in iodine solution in contact with 1-2 vol% NOx gas was examined in the range from room temperature to 80°C.
Upon contact with 2 vol% NOx gas, I3-ions in the solution disappeared within 1 h, and were replaced by iodine molecules (I2) in increasing concentration. A similar suppression of I3-ions was observed also with a starting liquid phase of concentrated I3-solution. This behavior of I3-and I− ions is attributed to the oxidation of these ions in the solution into I2 molecules by HN02 and HNO2 formed by the reaction between N02— contained in the NOx gas—and water. The above oxidation reactions set in when the HN03 concentration exceeds In. Beyond 10N HN03, the I3-molecules forming part of the I2 molecular structure, appear to be further oxidized into IO−3.
The oxidation of I3 in I-aqueous solution in contact with continuously supplied lvol% NOX is considered to be brought about in the initial stage by HNO2, and in the succeeding stage by HN03 after its concentration exceeds a threshold point around 1N.