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Rapid determination of CO2 production rates by a coulometric method
Soobum Chang,Yong Il Lee 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.4
Dissolved inorganic carbon (DIC) is one of funda-mental parameters affecting physicochemical conditions ofaquatic environments. Normally, for fresh water samples, acid-base titration with Gran plot is used to determine DIC. The pro-cedure, however, requires more than tens of milliliters of solutionvolume, and CO2 in the ambient air may interfere with the titra-tion. A monitoring system composed of a flow-through device anda CO2 coulometer was developed to measure slow CO2 productionrate in an aqueous system. In this method, sample solutions aredirectly injected into a flow-through chamber in which a stream ofCO2-free carrier gas continuously removes dissolved CO2 from theinjected solution. Degassed CO2 is delivered to the coulometer inwhich integrated amounts of CO2 are measured. Detection limit ofthe method was found to be lower than 1010-12 molesCO2/s, whichdepends on factors such as flow rates, total CO2 concentrations aswel as baseline drift of the coulometer. As a demonstration, themethod was applied to the determination of CO2 production ratesvia degradation of coal organic matter. The method can be used formonitoring of slow DIC production involved in various geochemicalprocesses including the weathering of silicates, disolution of car-bonates and the oxidation of sedimentary organic carbon.