Characteristic of Oil Products in Bottom Sediments in Lake Pyasino by GC/MS Method

Pub Date : 2023-11-24 DOI:10.1134/s0097807823030065

E. S. Brodskii, A. A. Shelepchikov, A. D. Kudryavtseva, E. Ya. Mir-Kadyrova

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Abstract

The integral methods commonly used to determine oil products, such as gravimetric, IR-photometric, and fluorescent do not take into account the nature of the analyzed compounds and the contribution of biogenic hydrocarbons, the assessment of which requires more detailed analysis, which can be made by GC/MS method. The oil products in Lake Pyasino bottom sediments show the presence of n-alkanes with a considerable predominance of C17 n-alkane and a small predominance of n-C₁₂, n-C₁₄, n-C₁₆, and n-C₁₈, reflecting the contribution of microorganisms and algae, as well as the predominance of n-C₂₃, n-C₂₅, n-C₂₇, n-C₂₉, n-C₃₁ due to the contribution of higher terrestrial plants. The chromatogram contains two “humps” of nonseparated compounds in the C₁₀−C₂₁ and C₂₂−C₃₃ regions. Oil products in them are mixtures of alkanes, cycloalkanes with 1–4 rings in a condensed system, and aromatic and naphthene-aromatic hydrocarbons with 1–3 benzol and 1–2 saturated rings in the condensed system, with alkyl substituents containing 0–12 (mostly, 2–8) C atoms.

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皮亚西诺湖湖底沉积物中油品特征的GC/MS分析

摘要常用的油品测定综合方法，如重量法、红外光度法、荧光法等，没有考虑被分析化合物的性质和生物烃的贡献，对生物烃的评价需要更详细的分析，可以采用GC/MS法。Pyasino湖底沉积物油品中存在正构烷烃，以C17正构烷烃为主，以n-C12、n-C14、n-C16、n-C18为主，反映了微生物和藻类的贡献，也反映了高等陆生植物对n-C23、n-C25、n-C27、n-C29、n-C31的贡献。色谱图在C10 - C21和C22 - C33区域包含两个未分离化合物的“峰”。其中的石油产品是烷烃、具有1-4环的缩合体系环烷烃、具有1-3苯环和1-2饱和环的缩合体系芳烃和环烷芳烃的混合物，烷基取代基含有0-12(主要是2-8)C原子。

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