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Vol. 20 (2017 year), No. 1, DOI: 10.21443/1560-9278-2017-20-1/2

Novikov M. A.
On the background values of heavy metal content in bottom sediments of the Barents Sea

Based on the long-term data the background content in the number of heavy metals in bottom sediments of the Barents Sea has been estimated. For the purpose to estimate the up-to-date state of the geochemical background the contents of heavy metals in bottom sediments of the Barents and the East Siberian Seas have been compared. To solve the problem of separating the natural background from the anthropogenic constituent the methods of mathematical statistics and geospatial analysis have been used. Mapping including geostatistical analysis has been performed in GIS application Arcview 3.2 environment with the use of a special approach. As a base map the bathymetric map of the Barents Sea made on the basis of own PINRO data has been used. The data from 559 stations in the Barents Sea and adjacent areas received from 1998 to 2015 have been processed. As a result of researches, the background content of nickel, copper, chromium, zinc, lead, and mercury in bottom sediments of that region has been suggested. The results of using different methods to estimate the background values including the suggested and Norwegian ones have been compared. It has been shown that the content of Ni and Cu in bottom sediments of the Barents Sea allowed us to speak about the regional negative geochemical anomaly concerning these metals. The distribution of contrast geochemical anomalies of the studied heavy metals in the Barents Sea area has been mapped. The conclusion about steady anthropogenic pollution of bottom sediments in the Western Murman coastal zone and the Kola Gulf mouth has been made. The other revealed geochemical anomalies need to be studied in future

(in Russian, стр.9, fig. 3, tables. 3, ref 13, Adobe PDF, Adobe PDF 0 Kb)

Vol. 21 (2018 year), No. 1, DOI: 10.21443/1560-9278-2018-21-1

Novikov M. A., Draganov D. M.
Pollution of water and bottom sediments of the Polar Front area in the Barents Sea with heavy metals

Pollution of the Barents Sea water and bottom sediments in the Polar Front area with heavy metals including Cu, Ni, Co, Cd, Hg, Zn, Pb and Cr has been considered based on the long-term data. The existence of a voluminous own database of Knipovich Polar Research Institute of Marine Fisheries and Oceanography (PINRO) on the content of metals in the surface layer of water and bottom sediments of the Barents Sea is the prerequisite for carrying out the research. At the first stage of the study, the data from 32 stations located in the Polar Front zone and obtained in the period from 2001 to 2013 have been derived and processed using GIS technologies and mathematical statistics from the database. Further, based on methods previously proposed by PINRO, the background values of the content of the listed metals in water and bottom sediments of the Polar Front, the zone of contact and transformation of the Atlantic and Arctic water masses have been calculated. In most cases, the values obtained have exceeded those established for neighboring water masses. As a result of the research, the maps of distribution of the pollution of sea water and bottom sediments with heavy metals have been made. Pollution is understood as the content of metals in concentrations exceeding the background level. It has been concluded about the persistent anthropogenic contamination of the Barents Sea Polar Front waters with some heavy metals, as well as of its bottom sediments with mercury in autumn period. The assumption has been made that the frontal zone accumulated the pollution coming from neighbouring contacting Atlantic and Arctic water masses. It has been shown that the pollution of the water in the frontal zone is mostly not accompanied by contamination of the underlying bottom sediments. With respect to the content of Ni, Cr and Pb in bottom sediments, one can speak of the detection of positive local geochemical anomalies.

(in Russian, стр.9, fig. 4, tables. 2, ref 19, adobe PDF, adobe PDF 0 Kb)

Vol. 22 (2019 year), No. 1, DOI: 10.21443/1560-9278-2019-22-1

Novikov M. A., Titov O. V., Zhilin A. Yu.
Metal content in bottom sediments of the central part of the Pechora Sea in the current period

Based on the data from the marine researches of Knipovich Polar Research Institute of Marine Fisheries and Oceanography (PINRO) carried out in the period of 2010–2015, the content of some metals in bottom sediments of the central part of the Pechora Sea has been analyzed at 99 stations. The particle size distribution and pH of the surface layer of sediments have been investigated. No interannual changes in the studied parameters have been revealed. According to the studies conducted, the predominant form of bottom sediments is fine sand, occasionally sandy loam has been found. Comparison of the average relative content of the number of studied trace elements in the Pechora Sea bottom sediments with those ones of the White Sea and the Upper Continental Crust (UCC) standard has not revealed any fundamental differences. It has been shown that Pb and Cd content is the most variable in the bottom sediments. The median values of the concentration factors of all the studied trace elements in the Pechora Sea sediments, normalized by UCC, are noticeably less than 1. The diagrams of the position of the relative content points of the studied elements pairs in the Pechora Sea sediments have been graphed and analyzed. These diagrams have been compared with those ones for the corresponding pairs of elements in the sediments of the Chukchi and East-Siberian Seas and certain differences have been revealed that are most noticeable with respect to the Pechora and East-Siberian Seas. The relative similarity of the composition of the Pechora Sea to the Chukchi Sea bottom sediments has been found. The data on statistical processing of the average contents of all the studied metals in the bottom sediments are given. No noticeable differences from the results of previous studies in the Pechora Sea have been found. Correlation analysis of the content of trace elements has been performed. Analysis of the data presented has not revealed anthropogenic contamination in the bottom sediments of the Pechora Sea with heavy metals; as a result, background levels for the Pechora Sea bottom sediments have been recommended for Cu, Zn, Ni, Cr, Pb, Cd and Hg

(in Russian, стр.11, fig. 5, tables. 3, ref 19, Adobe PDF, Adobe PDF 0 Kb)