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Geochemical Characteristics of the Vertical Distribution of Heavy Metals in the Hummocky Peatlands of the Cryolithozone

Author

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  • Roman Vasilevich

    (Institute of Biology, Komi Science Center, Ural Branch, Russian Academy of Sciences, 167982 Syktyvkar, Russia)

  • Mariya Vasilevich

    (Institute of Biology, Komi Science Center, Ural Branch, Russian Academy of Sciences, 167982 Syktyvkar, Russia)

  • Evgeny Lodygin

    (Institute of Biology, Komi Science Center, Ural Branch, Russian Academy of Sciences, 167982 Syktyvkar, Russia)

  • Evgeny Abakumov

    (Department of Applied Ecology, Faculty of Biology, Saint Petersburg State University, 199178 St. Petersburg, Russia)

Abstract

One of the main reservoirs depositing various classes of pollutants in high latitude regions are wetland ecosystems. Climate warming trends result in the degradation of permafrost in cryolitic peatlands, which exposes the hydrological network to risks of heavy metal (HM) ingress and its subsequent migration to the Arctic Ocean basin. The objectives included: (1) carrying out a quantitative analysis of the content of HMs and As across the profile of Histosols in background and technogenic landscapes of the Subarctic region, (2) evaluating the contribution of the anthropogenic impact to the accumulation of trace elements in the seasonally thawed layer (STL) of peat deposits, (3) discovering the effect of biogeochemical barriers on the vertical distribution of HMs and As. The analyses of elements were conducted by atom emission spectroscopy with inductively coupled plasma, atomic absorption spectroscopy and scanning electron microscopy with an energy-dispersive X-ray detecting. The study focused on the characteristics of the layer-by-layer accumulation of HMs and As in hummocky peatlands of the extreme northern taiga. It revealed the upper level of microelement accumulation to be associated with the STL as a result of aerogenic pollution. Specifically composed spheroidal microparticles found in the upper layer of peat may serve as indicators of the area polluted by power plants. The accumulation of water-soluble forms of most of the pollutants studied on the upper boundary of the permafrost layer (PL) is explained by the high mobility of elements in an acidic environment. In the STL, humic acids act as a significant sorption geochemical barrier for elements with a high stability constant value. In the PL, the accumulation of pollutants is associated with their sorption on aluminum-iron complexes and interaction with the sulfide barrier. A significant contribution of biogenic element accumulation was shown by statistical analysis.

Suggested Citation

  • Roman Vasilevich & Mariya Vasilevich & Evgeny Lodygin & Evgeny Abakumov, 2023. "Geochemical Characteristics of the Vertical Distribution of Heavy Metals in the Hummocky Peatlands of the Cryolithozone," IJERPH, MDPI, vol. 20(5), pages 1-20, February.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:5:p:3847-:d:1076043
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    References listed on IDEAS

    as
    1. G. Mazhitova & G. Malkova (Ananjeva) & O. Chestnykh & D. Zamolodchikov, 2004. "Active‐layer spatial and temporal variability at European Russian Circumpolar‐Active‐Layer‐Monitoring (CALM) sites," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 15(2), pages 123-139, April.
    2. Simone Ohlwein & Ron Kappeler & Meltem Kutlar Joss & Nino Künzli & Barbara Hoffmann, 2019. "Health effects of ultrafine particles: a systematic literature review update of epidemiological evidence," International Journal of Public Health, Springer;Swiss School of Public Health (SSPH+), vol. 64(4), pages 547-559, May.
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