Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption
Total and non-carbonate carbon were determined by a method using infrared absorption in 20 international geological reference samples, 13 in-house reference samples and 13 other rock samples. For the determination of total carbon, CTOT, the samples were combusted at 1370°C in oxygen flow. Non-carbon...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
1990-12-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume62/sgs_bt_062_2_pages_149_156.pdf |
| Summary: | Total and non-carbonate carbon were determined by a method using infrared absorption in 20 international geological reference samples, 13 in-house reference samples and 13 other rock samples. For the determination of total carbon, CTOT, the samples were combusted at 1370°C in oxygen flow. Non-carbonate carbon, CNONC, was determined in a similar way but the samples were leached with hydrochloric acid to remove carbonate carbon before combusting. The concentration of carbonate carbon, CO2, was calculated from the difference CTOT ‒ CNONC. The results (CTOT, CNONC and calculated CO2) for the 20 international geological reference samples compared well with published data. The results (CTOT, CNONC and calculated CO2) for the 13 in-house reference and 13 other rock samples agreed well with the results obtained by gravimetric methods. The precision of the used method was good: relative standard deviation was about 1%, 5% and 10% when the carbon content of the sample was 10%, 1% and 0.1% respectively. The effective detection limit was 0.01 ‒ 0.02% C. |
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| ISSN: | 0367-5211 1799-4632 |