[Interaction between chemical substances contaminating a gaseous medium of hermetically sealed compartments]

We have analyzed pertinent literature data and hypothesized that chemicals in an enclosed environment may interact (products of polymer outgassing, volatile metabolites of man). We have demonstrated that photochemical processes, thermochemical degradation and oxidation of chemicals in an enclosed atmosphere may lead to the formation of new highly toxic substances. The chemical composition of an enclosed atmosphere may be influenced by the technological processes of air purification. We have carried out experiments in a small enclosure to study ammonia and carbon dioxide interaction. When the concentration of ammonia is about 100 mg/m3, that of carbon dioxide is 2.5 vol. % and relative humidity of the atmosphere is 40-50%, the formation reaction of ammonia carbonate compounds proceeds very slowly, producing no significant changes in the environmental toxicological characteristics. It is recommended to continue the study of the interaction of chemicals at low concentrations in an enclosed environment.