Hydrogen peroxide formation during radiolysis of aerated aqueous solutions of organic molecules
A large number of aromatic molecules were irradiated in 10 -4 moldm -3 concentration air-saturated aqueous solutions; the hydrogen peroxide production was followed. H 2 O 2 formed with an initial yield of 2.5-3.5x10 -7 molJ -1 , the concentration had a maximum (~3x10 -4 moldm -3 ) due to the competition between the formation and decay. The H 2 O 2 concentration increased with the dose rate in purified water samples, here the * OH+ * OH reaction dominated in H 2 O 2 production. In the presence of aromatic compounds the H 2 O 2 concentration decreased with the increasing dose rate: the main source of H 2 O 2 was the termination reaction of the O 2 *- /HO 2 * pair. This pair formed in the e aq - + O 2 and H * +O 2 reactions and also in elimination from organic peroxy radicals. The dose rate dependence was attributed to the changes in the ratios of the different formation ways of H 2 O 2 . The main H 2 O 2 consuming process was suggested to be the e aq - +H 2 O 2 reaction. In the present study the Cu(II)/phenanthroline H 2 O 2 test was used for concentration determination. The test was found to be applicable in wide concentration range, but it provided false results when the solutions contained phenol type compounds. To overcome such interferences the removal of these compounds by liquid-liquid extraction was suggested.
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- DOI : http://dx.doi.org/10.1016/j.radphyschem.2016.12.023
- Elsevier : 저널> 권호 > 논문
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