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An Automated Manometric Method for Quantitative Determination of Calcite and Dolomite¹

ABSTRACT

A rapid automated method is described for differentiation and quantitative determination of calcite and dolomite in earth materials. The method is based on differential pseudo-first-order kinetic rates of dissolution of the two carbonate species when reacted with excess of 5M HCl. The method employs manometric measurement of acid-liberated CO₂ with a differential pressure transducer coupled to a strip chart recorder. Tested on calcite and dolomite singly and together in geologic materials, the method is highly discriminatory, highly sensitive, and extremely rapid. Theoretical treatments of pseudo-first-order kinetic reactions and of manometric measurements associated with the method are reviewed.

¹ Contribution from the Dep. of Land, Air and Water Resources, University of California, Davis, CA 95616. The research leading to this report was supported by the Office of Water Research and Technology, USDI, under the Matching Grant program of Public Law 95-467, as amended, and by the Univ. of California Water Resources Center, as part of Office of Water Research and Technology Project No. B-201-CAL and Water Resources Center Project UCAL-WRC-W-582.

² Research Assistant, Professor of Soil Science and Professor of Water Science, respectively. Senior author is now Assistant Extension Professor, Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546-0091.

Received for publication April 20, 1983. Accepted for publication May 21, 1984.

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