The electrometric method for the measurement of Pco2 in soil atmospheres is considered from the pomt of view of accuracy and equilibration time. Departures from the expected relationship between the equilibrium pH of 0.01 M sodium bicarbonate solution and Pco2 emphasize the need for calibrations with each experimental procedure. A particular weakness of the method is the long equilibration time which is shown to be susceptible to both temperature and Pco2 gradient and to be particularly long in the range of the most frequently encountered CO2 concentrations in the soil.
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