A pH Method for Determining the Carbon Dioxide Exchanges of Marine, Brackish - Water, and Freshwater Organisms

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Abstract
The pH method of determining carbon dioxide exchange has hitherto been available only for freshwater and marine organisms, the necessary determinations of the relation between pH, excess base and CO2-content having been made, in the one case by Prideaux, and in the other by M'Clendon and co-workers. In order to extend the method to the study of organisms inhabiting brackish waters, of excess base content between that of fresh water and sea water, the determinations of Buch have been utilised, and have been recalculated to a common basis with the foregoing. The combined results have been plotted as a series of regular curves, which should be of value in comparative metabolic studies of littoral and estuarine forms.