DETERMINATION OF THE FORMS OF CARBON IN GEOLOGIC MATERIALS |
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| Authors: | Lany L JACKSON Steven R ROOF |
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| Institution: | U.S. Geological Survey, Box 25046, MS 973, DFC, Denver, CO 80225, U.S.A.;Department of Geology and Geography, Morrill Science Center, University of Massachusetts, Amherst, MA 01003, U.S.A. |
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| Abstract: | Total carbon was determined in 30 geological reference materials by combustion/IR and combustion/coulometry methods. The combustion/coulometric method does not require empirical calibration and was found to be more precise than the combustion/IR method despite the use of smaller sample sizes. Carbonate carbon was determined by coulometric titration of acid-evolved CO2. Non-carbonate carbon was calculated as the difference between the total and carbonate carbon contents. |
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