The biogeochemistry of some heavy metals and metalloids in the Ob River estuary-Kara Sea section |
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Authors: | L L Demina V V Gordeev S V Galkin M D Kravchishina S P Aleksankina |
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Institution: | 1.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The biogeochemical behavior of the group of heavy metals and metalloids in the water (including their dissolved and suspended
particulate forms), bottom sediments, and zoobenthos was studied in the Ob River estuary-Kara Sea section on the basis of
the data obtained during cruise 54 of the R/V Akademik Mstislav Keldysh in September–October 2007. The changes in the ratios of the dissolved and suspended particulate forms of Fe, Mn, Zn, Cu,
Pb, Cd, and As were shown, as well as the growth of the fraction of adsorbed forms in the near-bottom suspended particulate
matter under the mixing of the riverine and marine waters. The features of the metals’ accumulation in the typical benthic
organisms of the Ob River estuary and the Kara Sea were revealed, and their concentrating factors were calculated based on
the specific conditions of the environment. It was shown that the shells of the bivalves possessing a higher biomass compared
to the other groups of organisms in the Ob River estuary play an important role in the deposition of heavy metals. The mollusks
of the Ob River estuary accumulate Cd and Pb at the background level, whereas the Cu and Zn contents appear to be over the
background level. |
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