Removal of dissolved oxygen from aqueous media by ionizing radiations

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Abstract
Tris-acetate buffer (0.14 M, pH7), alone or containing Shigella flexneri in suspension, was irradiated with 250 kVp X-rays or 7 MeV electrons in closed vessels or in vessels bubbled with gas containing oxygen. The removal of dissolved oxygen by the radiation was followed with a polarographic electrode. The rate of removal of oxygen at tensions below 5 mm Hg was 2.0 mm Hg/K rad with both electron and X-irradiation of buffer solution. It was about 10% greater with Shigella in suspension. The rate of removal was lower at higher oxygen tensions, and the mean G-o2 for oxygen removal between air tension and zero was 2.8, compaied with 3.4 at all tensions below 5 mm Hg down to less than 0.2 mrn Hg. Bubbling of the solution during inadiation did not alter the G-value significantly, since the fall in oxygen tension could be correlated well with the measured equilibration time constant of the solution and the G-value obtained in closed vessels.

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