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<p>We studied the layer-by-layer distribution of polycyclic aromatic hydrocarbons (PAHs) in peatlands of the Russian European Arctic and identified the main factors influencing the composition of PAHs in frozen tundra, depending on the type of peat formation and the geographical location of the study sites. The samples were analyzed by reversed-phase HPLC in gradient mode and spectrofluorimetric detection. Kruskal–Wallis ANOVA median test and non-metric multidimensional scaling method were used for statistical analysis. Concentrations of both 2–4 ring and 5–6 ring PAHs were reliably higher in fen layers than in transitional and raised layers. Fen-type peat horizons formed during the Holocene climatic optimum contained significant amounts of 5,6-ring PAHs, closely related to the mineralization of humic acids and the condensation of lignin polyphenolic structures from hypnum mosses and herbaceous vegetation. The formation of 5,6-ring PAHs in the peat layers of transitional and raised peats may also be due to the condensation of lignin. But, the source of lignin in these layers was predominantly herbaceous and woody debris. The PAH composition of the upper peat layers down to the permafrost depth may have been influenced by climatic and aerotechnogenic factors.</p>

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Factors influencing the accumulation of PAHs in mound peatlands of the European Arctic

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Evgenia V. Yakovleva,
  • Dmitriy N. Gabov,
  • Roman S. Vasilevich,
  • Li Sun,
  • Yuriy A. Dubrovskiy

摘要

We studied the layer-by-layer distribution of polycyclic aromatic hydrocarbons (PAHs) in peatlands of the Russian European Arctic and identified the main factors influencing the composition of PAHs in frozen tundra, depending on the type of peat formation and the geographical location of the study sites. The samples were analyzed by reversed-phase HPLC in gradient mode and spectrofluorimetric detection. Kruskal–Wallis ANOVA median test and non-metric multidimensional scaling method were used for statistical analysis. Concentrations of both 2–4 ring and 5–6 ring PAHs were reliably higher in fen layers than in transitional and raised layers. Fen-type peat horizons formed during the Holocene climatic optimum contained significant amounts of 5,6-ring PAHs, closely related to the mineralization of humic acids and the condensation of lignin polyphenolic structures from hypnum mosses and herbaceous vegetation. The formation of 5,6-ring PAHs in the peat layers of transitional and raised peats may also be due to the condensation of lignin. But, the source of lignin in these layers was predominantly herbaceous and woody debris. The PAH composition of the upper peat layers down to the permafrost depth may have been influenced by climatic and aerotechnogenic factors.