Abstract
A review of recent work on the UV photolysis of nitrate-bearing material and NOχ is carried out and a laboratory investigation is made of rates of halogen separation from concentrated sea water by the action of UV radiation. Effects of pH, concentration, light intensity, NO −3 additive and temperature are evaluated in terms of broad trends on the process studied at a reduced pressure in an air flow. Rates of release, of NOχ and halogens from the liquid interphase photolyzed, are found to depend directly on the nitrate present, and exponentially on the concentration of sea water, light intensity and acidity. Those rates are also found to be inhibited by temperature. The process of halogen and NOχ release is believed to be triggered by the formation of transient pernitrite intermediate oxidants and is thought to be of importance in understanding both, some of the natural oxidative reactions which occur in the atmosphere, and of the processes which lead to the formation of hygroscopic Aitken nuclei from those released gases. An added point of interest consists in the possibility of halogenation and/or nitration of organic substance present in nitrate-bearing marine aerosol, and of a progress towards the explanation of differences in the Cl:Na ratio between this aerosol and sea water.
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Petriconi, G.L., Papee, H.M. On the photolytic separation of halogens from sea water concentrates. Water Air Soil Pollut 1, 117–131 (1972). https://doi.org/10.1007/BF00187701
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DOI: https://doi.org/10.1007/BF00187701