Citation:

S0016702906020078

Name: Speciation of metals in bottom sediments from the south Kara Sea and Ob and Yenisei estuarine zones
Published: 2006
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Speciation of Fe, Mn, Zn, Cu, Co, Ni, Cr, Pb, and Cd was studied in 52 samples of bottom sediments collected during Cruise 49 of the R/V "Dmitry Mendeleev" to the estuaries of the Ob and Yenisei rivers and to the southwest Kara Sea. Immediately after sampling the samples were subjected to on-board consecutive extraction to separate metal species according to their modes of occurrence in the sediments: (1) adsorbed, (2) amorphous Fe-Mn hydroxides and related metals, (3) organic + sulfide, and (4) residual, or lithogenic. Atomic absorption spectroscopy of the extracts was carried out at a stationary laboratory. Distribution of Fe, Zn, Cu, Co, Ni, Cr, Pb, and Cd species is characterized by predominance of lithogenic or geochemically inert modes (70-95% of bulk contents), in which the metals are bound in terrigenous and clastic mineral particles and organic detritus. About half of total Mn amount and 15-30% of Zn and Cu are contained in geochemically mobile modes. Spatiotemporal variations in proportions of the metal species in the surface layer of sediments along sub-meridional sections and through vertical sections of bottom sediment cores testify that Mn and, to a lesser extent, Cu are the most sensitive to changes in sedimentation environment. The role of their geochemically mobile species notably increases under reducing conditions.

Project(s):

Archive of Ocean Data (ARCOD)

Coverage:

Median Latitude: 72.649447 * Median Longitude: 74.550773 * South-bound Latitude: 68.823800 * West-bound Longitude: 60.752200 * North-bound Latitude: 76.017700 * East-bound Longitude: 83.318700

Event(s):

DM49-4394-1 * Latitude: 70.621700 * Longitude: 60.752200 * Elevation: -138.0 m * Location: Kara Sea * Campaign: (SPASIBAIII) * Basis: Dmitry Mendeleev * Method/Device: Gravity corer (GC)

DM49-4395-1 * Latitude: 74.230700 * Longitude: 72.972500 * Elevation: -30.0 m * Location: Kara Sea * Campaign: (SPASIBAIII) * Basis: Dmitry Mendeleev * Method/Device: Box corer (BC)

DM49-4396-1 * Latitude: 74.980200 * Longitude: 72.841500 * Elevation: -34.0 m * Location: Kara Sea * Campaign: (SPASIBAIII) * Basis: Dmitry Mendeleev * Method/Device: Grab (GRAB)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

6 datasets

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Datasets listed in this publication series

Demina, LL; Levitan, MA; Politova, NV (2006): (Table 1) Speciation of metals in bottom sediments of Core DM49-4394-1 from the Kara Sea. https://doi.org/10.1594/PANGAEA.725825
Demina, LL; Levitan, MA; Politova, NV (2006): (Table 1) Speciation of metals in bottom sediments of Core DM49-4397-2 from the Kara Sea. https://doi.org/10.1594/PANGAEA.725826
Demina, LL; Levitan, MA; Politova, NV (2006): (Table 1) Speciation of metals in bottom sediments of Core DM49-4413-3 from the Enisei estuary. https://doi.org/10.1594/PANGAEA.725827
Demina, LL; Levitan, MA; Politova, NV (2006): (Table 1) Speciation of metals in bottom sediments of Core DM49-4416-1 from the Obskaya Guba (Ob estuary). https://doi.org/10.1594/PANGAEA.725828
Demina, LL; Levitan, MA; Politova, NV (2006): (Table 1) Speciation of metals in the surface layer of bottom sediments from the Ob and Yenisei estuaries and the southern Kara Sea. https://doi.org/10.1594/PANGAEA.725829
Demina, LL; Levitan, MA; Politova, NV (2006): (Table 2) Physical properties of surface sediments from the Enisei section and Al and Si contents in their dry bulk matter. https://doi.org/10.1594/PANGAEA.725830