Abstract
With nitrate ions the polarons of water radiolysis undergo reaction to an intermediate of the tetravalent state of nitrogen. In presence of OH scavengers (ethanol, J−) nitrite is formed by a consequent reaction. But low yields due to back reactions were observed in pure solutions of nitrates [1, 2]. In 1 M sodium nitrate the nitrite yield was raised to = 6·5 molecules per 100 eV by addition of 0·15 M ammonia after Sharpaty et al. The effect was interpreted as oxidation of ammonia to nitrite and water [3]. We compared the yields of nitrite in deaerated solutions of potassium nitrate in presence of 0·2 M ammonia, 0·2 M methanol, or both after irradiation with 60Co-γ-rays. In 10−2 M solution nearly equals the polaron yield if ammonia was added.
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