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FEATURES OF THE ORGANIC CARBON DISTRIBUTION AND ITS RELATIONSHIP WITH CONTENTS OF HEAVY METALS IN BOTTOM SEDIMENTS OF THE NORTHERN DVINA RIVER MOUTH AREA
Abstract
The rivers of the Northern part of European territory of Russia (ETR) contain large amounts of organic matter. This is due to natural features of the area (short cool summer, high wetlands, large areas of forests and features of soil formation), and to specificity of the anthropogenic impact. One of the largest rivers of the Northern ETR is the Northern Dvina River, flowing into the Dvina Bay of the White Sea. A general study of the organic carbon content in the bottom sediment of the Northern Dvina River mouth area was carried out since 2004. The paper studies the content of organic carbon in warm (August) and cold (February-March) periods of the year characterized by different physical and chemical, hydrology and meteorological situation. Over 40 samples were examined. The main features of the temporal and spatial distribution of organic carbon in the Northern Dvina River mouth area were discussed. The highest concentrations of organic carbon are found in the wastewater discharge zones of the woodworking, pulp and paper and timber chemical industries. The organic carbon content was significantly higher in warm season than in the cold season. The role of such factors as hydrodynamic characteristics of the water body, substrate of bottom sediments, sources of organic matter and the role of anthropogenic activities in its receipt were evaluated. The correlation dependences between the content of organic carbon and heavy metals in the bottom sediments of the study area was estimated. The significant correlation coefficients between contents of some heavy metals (zinc and cadmium) and organic matter were determined. It's confirms a significant role of organic carbon in the heavy metals accumulation in the bottom sediments.
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References15
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