DBPapers
DOI: 10.5593/SGEM2014/B52/S20.056

MERCURY AND ORGANIC MATTER IN BOTTOM SEDIMENTS IN THE PROFILE DON RIVER- SEA OF AZOV

Y. Fedorov, I. Dotsenko, A. Mikhailenko
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-18-6 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 2, 423-430 pp

ABSTRACT
Large-scale and long-term studies of the total mercury distribution in the sediments of the area and the profile of the Don River – the Sea of Azov is made. The samples of bottom sediment were sampled from the shipboard by means of a coring tube. The determining of total mercury concentration was produced by cold vapor atomic absorption spectroscopy. The organic carbon content was determined using a high organic carbon analyzer and ranged between 0.26 - 3.19 %. The content of mercury was varying widely - from 0.01 to 5.0 μg/g dry weight at different times in the sediments of the Don River, the Taganrog Bay and the Sea of Azov. It is observed that high concentrations of mercury are associated with impact areas (urban agglomerations, port terminals), where organic matter of anthropogenic origin is damping. The concentrations of mercury tend to increase in sediment with increasing concentrations of the clay and organic matter fractions of different genesis. There is a close correlation between total mercury and organic carbon. This indicates greater role autochthonous and allochthonous organic matter in the accumulation of mercury in the bottom sediments in comparison with mineral substance. During the storm, re-suspension of the top layer of sediments and transfer of mercury in the water column is observed. A reverse process of deposition of mercury in mineral and organic slurry is defined afterwards.

Keywords: Don River, Sea of Azov, Taganrog Bay, mercury, organic matter, bottom sediments