科研之友
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摘要
A stable isotopic composition in materials has provided useful information concerning their origins and histories. For a carbon isotopic measurement of a single organic molecule, the total organic carbon contained in the molecule should be converted quantitatively to carbon dioxide. Therefore, the carbon isotopic composition represents an average value for the molecules. In principle, information concerning the origins and histories of organic molecules exists at the specific position of the molecule. To retrieve diverse, complex, and specific information of their origins and histories from organic molecules, a measurement of the position-specific carbon isotopic composition is required. So far, a difficult measurement have prevented any development for the position-specific isotopic measurement. Here, we describe recent advances in analytical instrumentation concerning a position-specific carbon isotopic measurement for organic molecules using gas chromatography-combustion-isotope ratio mass spectrometry combined with an on-line pyrolysis technique.
- 出版日期2014-3
