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Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption

1990; Geological Society of Finland; Volume: 62; Issue: 2 Linguagem: Inglês

10.17741/bgsf/62.2.005

1799-4632

R.J. Saikkonen, I.A. Rautiainen,

Hydrocarbon exploration and reservoir analysis

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, C TOT , the samples were combusted at 1370°C in oxygen flow.Non-carbonate carbon, C NONC , 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, C0 2 , was calculated from the difference C T0T -C NON c-The results (C T0T , C NONC and calculated C0 2 ) for the 20 international geological reference samples compared well with published data.The results (C XOT , C NONC and calculated C0 2 ) 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.