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Published in Soil Sci Soc Am J 48:1030-1033 (1984)
© 1984 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Routine Procedure for Rapid Determination of Soil Carbonates1

R. H. Loeppert, C. T. Hallmark and M. M. Koshy2

ABSTRACT

A procedure is presented for the routine determination of soil carbonates based on the following reaction: CaCO3 + 2 HC2H3O2 -> Ca2+ + 2 C2H3O2- + H2O + CO2 (g) A known quantity of acetic acid is added to a known quantity of soil. The pH of the reaction mixture is then determined following complete dissolution of CaCO3. Calcium carbonate content is determined empirically from a standard curve relating pH to known CaCO3 content according to the equation: pH = K + n log [CaCO3/(T – CaCO3)], in which T equals the total amount of calcium carbonate which could be completely dissolved by the acetic acid added to the system, and K and n are constants. Several possible sources of error exist in the procedure; however, potential errors may be minimized by the maintenance of optimum working conditions. Results obtained by the acetic acid procedure compared favorably with results obtained by the Chittick procedure. The proposed procedure has the advantage of simplicity and offers a rapid alternative for routine determination of soil carbonates.

NOTES

1 Contribution from the Texas Agric. Exp. Stn. as Journal Series no. 18981. This research was partially supported by a grant from the Center for Energy and Mineral Resources.

2 Assistant Professor, Associate Professor, and Research Associate, Dep. of Soil and Crop Science, Texas A&M University, College Station, TX 77843.

Received for publication September 6, 1983. Accepted for publication March 20, 1984.






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