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Published in Soil Sci Soc Am J 38:738-742 (1974)
© 1974 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Reactions among Calcium Carbonate, Carbon Dioxide, and Sodium Adsorbents1

G. Cruz-Romero and N. T. Coleman2

ABSTRACT

Equations for Na-Ca ion exchange, CO2 and CaCO3 solubility and H2CO3 ionization were solved to describe and predict conditions existing in aqueous systems containing Na-Ca adsorbent, CaCO3, CO2 and salt. Data from systems containing Dowex-50 or hydrobiotite and having CEC-H2O ratios approaching those occurring in soils were in reasonable agreement with the theory. For initially Na-saturated systems, the pH varied from 7.5 at PCO2 = 0.1 atm to 10.5 at PCO2 near zero. Corresponding solution concentrations of NaHCO3·Na2CO3 were 55 and 16 meq/liter. Extremely low Ca concentrations were predicted and observed for high Na saturation and low CO2 pressure. The NaHCO3 concentration and pH varied predictably with initial Na saturation, PCO2, NaCl concentrations and relative adsorption affinity for Na and Ca. The demonstrated predictive ability may be useful in considering plant nutrition and soil reclamation problems.

NOTES

1 Part of the senior author's Ph.D. dissertation at the Univ. of California, Riverside, 1968. Support from the Del Amo Foundation, Los Angeles, is acknowledged.

2 Former Graduate Student and Late Professor of Soils and Plant Nutrition, respectively. The senior author is now Catedrático de Edafología, Universidad Politécnica, Paseo al Mar, 21. Valencia 10 (Spain).

Received for publication January 2, 1974. Accepted for publication June 5, 1974.






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Copyright © 1974 by the Soil Science Society of America.