Abstract
Abstract It was found molecular oxygen is consumed during the photolysis of aerated aqueous solutions of nitrite ions. The photoprocess dominates in alkaline solutions (pH 8.3) while in acidic media (pH 5.3) thermal reactions overshadow photochemically induced changes. The absolute quantum yield of oxygen depletion was established. We also found that nitrite ions are more easily oxygenated by singlet oxygen. The process is profoundly affected by pH and depends on the ionic strength of the solutions. Steady state experiments with eosin Y as a sensitizer, and with continuous monitoring of oxygen concentration, allowed us to elucidate the absolute yield of 1 O 2 chemical consumption as a function of NO 2 − concentration and the ionic strength of the solutions. Since we tried to use the azide ions as physical quenchers of singlet oxygen, some supplementary remarks concerning their oxygen consumption are also presented in the Appendix.
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