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<p>This study examines the distribution of mercury in the brine, plankton, and bottom sediments of Lake Bolshoye Yarovoye. In inorganic complexes, mercury predominantly occurs as HgCl₄²⁻ and Hg(SR)₂. Within pore waters, mercury is mainly present as MeHgSR–DOM rather than MeHgCl. The accumulation of mercury in bottom sediments results from the precipitation and dissolution of Fe and Mn oxides and oxyhydroxides. The geochemical behavior of mercury in sediments is influenced by various sulfur species, including S(VI), S(II), and pyrite, which can restrict the bioavailability of mercury and affect the formation of MeHg. A strong correlation is observed between the distribution of Hg–OM and S(II) within the upper 50&#xa0;cm of the sediment column. Vertical migration of anthropogenic mercury within the sediment core has been detected, facilitated by the high water content. At a depth of 110–120&#xa0;cm, a geochemical barrier is formed, representing a zone of active transformation of mercury species. A moderate level of mercury contamination was recorded in the bottom sediments and in the plankton <i>Artemia salina</i> within the impact zone of the “Altaikhimprom” plant.</p>

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Mercury species in zooplankton, brine, and bottom sediments of Hyperhaline Lake Bolshoye Yarovoye (South of Western Siberia)

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Mariya Gustaytis,
  • Anton Maltsev,
  • Galina Leonova,
  • Sergei Krivonogov

摘要

This study examines the distribution of mercury in the brine, plankton, and bottom sediments of Lake Bolshoye Yarovoye. In inorganic complexes, mercury predominantly occurs as HgCl₄²⁻ and Hg(SR)₂. Within pore waters, mercury is mainly present as MeHgSR–DOM rather than MeHgCl. The accumulation of mercury in bottom sediments results from the precipitation and dissolution of Fe and Mn oxides and oxyhydroxides. The geochemical behavior of mercury in sediments is influenced by various sulfur species, including S(VI), S(II), and pyrite, which can restrict the bioavailability of mercury and affect the formation of MeHg. A strong correlation is observed between the distribution of Hg–OM and S(II) within the upper 50 cm of the sediment column. Vertical migration of anthropogenic mercury within the sediment core has been detected, facilitated by the high water content. At a depth of 110–120 cm, a geochemical barrier is formed, representing a zone of active transformation of mercury species. A moderate level of mercury contamination was recorded in the bottom sediments and in the plankton Artemia salina within the impact zone of the “Altaikhimprom” plant.