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Published in Soil Sci Soc Am J 33:239-241 (1969)
© 1969 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Experimental Study of the Influence of the Partial Pressure of Carbon Dioxide on the pH Values of Aqueous Carbonate Systems1

F. N. Ponnamperuma, Ruby U. Castro and Carmen M. Valencia2

ABSTRACT

The pH values of 0.001N and 0.01N solutions of sodium carbonate and of aqueous suspensions of CaCO3, MnCO3, and FeCO3 equilibrated at 25C with CO2-N2 mixtures containing 1–100% CO2 conformed to the equations, pH = 7.85 + log Na+ – log PCO2 + log {gamma}HCO3- and pH = K – 2/3 log PCO2 + 1/3 log {gamma}HCO3- – 1/3 log {gamma}M2+, respectively. Suspensions of sodic and calcareous soils, equilibrated similarly, behaved like the corresponding simple systems, while reduced soils high in active iron yielded a pH-log PCO2 relationship almost identical with that obtained experimentally with an aqueous suspension of Fe3(OH)8.

NOTES

1 Contribution from The International Rice Research Institute, Los Baños, Laguna, The Philippines. Presented before Div. S-2, Soil Science Society of America, Washington D.C., Nov. 7, 1967.

2 Soil Chemist, Assistant Chemist, and Research Assistant, respectively, The International Rice Research Inst.

Received for publication April 25, 1968. Accepted for publication October 8, 1968.






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