DOI: 10.5593/SGEM2016/B31/S12.032


A.Ovsepyan , Y.Fedorov , A. Zimovets , V.Savitskiy
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-61-2 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 1, 243-250 pp

Preserving the natural environment of the northern regions of our planet is one of the priority issues discussed at the moment at the highest levels. This article presents the results of an experiment to study the diurnal dynamics of mercury content in water of the Northern Dvina River, which located in the Northwest of the European part of Russia and flows to the Dvina Bay of the White Sea. The experiment aims to study the features of intradaily variability of mercury concentrations and flows, identification of priority factors that determine the behavior of this element in the waters of the Northern Dvina. Along with sampling for analysis of content of total, dissolved forms of mercury and mercury in suspended matter, was carried out the definition of the water temperature, pH and Eh, the oxygen content in the water. We investigated the near-surface and near-bottom water horizons. This approach allowed to analyze the relationship between mercury content and physico-chemical parameters of water. Processing results of the study showed the presence of significant fluctuations of all forms of mercury migration during the study period. Diurnal dynamics of mercury content in the surface and near-bottom water layers investigated. The relationships that determine the dynamics of mercury in the diurnal cycle were researched reliably identified a direct correlation between mercury content, oxygen and pH of water. Period when there are minimum and maximum levels of mercury concentrations in the test water defined. Assumptions are made about the priority factors that determine the dynamics of the diurnal behavior of mercury. The influence of such an important hydrodynamic factor acting on the investigated object - tidal fluctuations was studied.
Similar studies were carried out for the first time, and the best of our knowledge, at this day so extensive and comprehensive studies of the behavior of one of the present priority pollutants - of mercury in the environment of the northern waters of the European part of Russia has not been fulfilled. Of particular interest is the integrated approach - simultaneously measured the levels of mercury and oxygen in water, temperature, pH and Eh of water. This allows us to detect relationships with various physico-chemical parameters of water, defining thus the priority factors of migration and transformation of mercury for further modeling. The results would be useful to assess the current state of the estuary ecosystem of the Northern Dvina River, to develop appropriate regional measures to protect nature and as the scientific basis of various protection measures.

Keywords: Mercury, diurnal dynamics, experiment study, estuary ecosystems, the North European Part of Russia