| 摘要 |
A method for determining a cyclic carbon content in a sample including burning a sample to generate carbon dioxide gas and measuring a total 14C amount in the sample from the carbon dioxide gas; burning the sample to confirm presence or absence of ash; when ash is present, treating the sample with an acid to generate carbon dioxide gas and measuring a 14C amount from the carbon dioxide gas; correcting the total 14C amount in the sample with the 14C amount measured by the acid treatment; and calculating a cyclic carbon content in the sample from the corrected total 14C amount in the sample.
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