Abstract
The total 12CO2 concentration ofa seawater sample can be accurately measured by adding a tracer quantity of NaH14CO3 in solution, acidifying the labeled seawater, and trapping a fraction of the gaseous 14CO2 + 12CO2 with a substoichiometric quantity of a quaternary amine (carbamate). If the same quantity of radioisotope is added to each of a set of standards and unknowns, the radioactivity of the carbamate will depend only on the specific activity of the label in the seawater sample.The decrease in carbamate radioactivity with increasing total 12CO2 in seawater is described by a simple functional relationship which is readily transformed to a linear equation. The method is well suited to the measurement of minute quantities of CO2 such as might arise from oxidation of dissolved organic carbon.
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