Generation of Nitrous Acid by Ultrasound Irradiation in the Organic Solution Consisting of Tri-n-butylphosphate, Nitric Acid and Water

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The generation of nitrous acid (HNO2) by ultrasound was investigated for an organic solution consisting of tri-n-butylphosphate, nitric acid (HNO3) and water under several conditions. The amount of HNO2 was found to increase by a factor of 40 upon ultrasound irradiation, and the concentration of HNO2 reached the steady-state after long time irradiation. Although the concentration of HNO3 was low, the rate of generation of HNO2 in the organic solution was higher than that in aqueous solution equilibrated with the organic solution. The formation rates of HNO2 were greatly enhanced with an increase in concentration of HNO3 in the organic solution. The concentration of HNO2 was higher in the absence of a gas phase, because the HNO2 was transferred from the solution into the gas phase as a form of NOx. In the presence of a gas phase, a higher concentration of HNO2 was obtained at a lower temperature, due to the higher solubility of NOx in the solution.
社団法人日本原子力学会の論文
2005-11-25