Speciation of metals in bottom sediments from the south Kara Sea and Ob and Yenisei estuarine zones
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2006
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| _version_ | 1867171357709565952 |
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| author | Demina, Lyudmila L Levitan, Mikhail A Politova, Nadezhda V |
| author_facet | Demina, Lyudmila L Levitan, Mikhail A Politova, Nadezhda V |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_725841 |
| institution | PANGAEA |
| language | en |
| publishDate | 2006 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Speciation of metals in bottom sediments from the south Kara Sea and Ob and Yenisei estuarine zones Demina, Lyudmila L Levitan, Mikhail A Politova, Nadezhda V Archive of Ocean Data; ARCOD; BC; Box corer; DM49; DM49-4394-1; DM49-4395-1; DM49-4396-1; DM49-4397-2; DM49-4398-1; DM49-4399-1; DM49-4401-3; DM49-4406-1; DM49-4408-1; DM49-4409-1; DM49-4410-1; DM49-4411-1; DM49-4412-1; DM49-4413-1; DM49-4413-3; DM49-4414-2; DM49-4415-2; DM49-4416-1; DM49-4417-2; DM49-4418-1; Dmitry Mendeleev; GC; Grab; GRAB; Gravity corer; Kara Sea; Men4400-1; Men4402-1; SPASIBAIII 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. |
| title | Speciation of metals in bottom sediments from the south Kara Sea and Ob and Yenisei estuarine zones |
| topic | Archive of Ocean Data; ARCOD; BC; Box corer; DM49; DM49-4394-1; DM49-4395-1; DM49-4396-1; DM49-4397-2; DM49-4398-1; DM49-4399-1; DM49-4401-3; DM49-4406-1; DM49-4408-1; DM49-4409-1; DM49-4410-1; DM49-4411-1; DM49-4412-1; DM49-4413-1; DM49-4413-3; DM49-4414-2; DM49-4415-2; DM49-4416-1; DM49-4417-2; DM49-4418-1; Dmitry Mendeleev; GC; Grab; GRAB; Gravity corer; Kara Sea; Men4400-1; Men4402-1; SPASIBAIII |
| url | https://doi.org/10.1594/PANGAEA.725841 |