TEMPERATURE DEPENDENCE OF pH RELAXATION TIME IN AQUEOUS SALT SOLUTIONS WITH DISSOLVED CARBON DIOXIDE

Abstract

To investigate the physical nature of optimal temperature, lower and upper temperatures for the life interval of warm-blooded organisms we have considered the relaxation time of the pH parameter in dilute aqueous NaCl solutions in contact with atmospheric carbon dioxide. For this purpose, the establishment of equilibrium distribution of carbon dioxide in aqueous salt solutions in contact with atmospheric air starting from some time is investigated. More precisely, the relaxation time of carbon dioxide, as a function of temperature and pH, is investigated. It is found that the pH relaxation time is a very nontrivial function of temperature, pH values and sodium chloride concentration. We have shown that all characteristic temperatures correspond to the minimum value of the relaxation time considered as a function of temperature and pH. Using selection principle and our experimental data, we have shown that the lower and upper temperature limits for their possible activity are close to 30°C and 42°C, respectively [1].