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In an earlier paper (Brosset, 1982) the total Hg in air over Sweden was discussed. The present paper is mainly devoted to oxidized Hg, its origin, transportation and reaction with water. A new nomenclature has been introduced based on the physical properties of Hg-compounds which determine their distribution between air and water and also, as has been the custom hitherto, on their oxidation-reduction properties. It has been established that precipitation contains Hg-salts which are formed through oxidation of metallic vapor in an acid water phase. Rather stable Hg-compounds which seem to be anthropogenic and of the same origin as soot particles are also found in the precipitation.

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