Isotopic analysisFigure 2. Part of the isotopic-ratio-monitoring gas chromatogram of the phenanthrenic fraction of BAL 250.Peaks represent CO 2 produced by the combustion of phenanthrene and methylphenanthrenes.The lower trace shows the m/z 44 ion current as a function of time and the upper trace depicts the m/z 45 to m/z 44 ion-current ratio.
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Mazéas et al. (1999) studied this question.
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