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[求助] 原油正构烷烃组分ΣC21-/ΣC22+比值来源和解释

大家好:
       我写了一篇原油生物降解方面的文章,其中涉及到原油正构组分变化趋势,我用了其中一个指标ΣC21-/ΣC22+来表示不同碳链长度的正构烷烃的降解趋势。其中一个审稿人问我为什么用这个指标,而不是ΣC22-/ΣC23+或者其他(为什么从C21到C22拆分)。我的地化背景有限,也没有在网上找到原始的文献来解释和介绍这个指标,可否请大牛们提供相关的参考文献,最好是英文的。谢谢大家。
3. Long chain n-alkanes are classified as those with carbon chain length greater than 23 (Line 241), however the ratio ΣC21-/ΣC22+ is used to characterize the degradation of longer-chain n-alkanes to relatively shorter ones. Why ΣC22+ and NOT ΣC23+? This needs careful explanation.(我的实验中发现碳链在23以上的明显发生了降解)
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