Meteorological phenomenon as a key factor controlling variability of labile particulate mercury in rivers and its inflow into coastal zone of the sea
Karolina Gębka , Magdalena Bełdowska , Dominika Saniewska , Ewa Korejwo , Michał Saniewski
AbstractMercury (Hg) is recognized as a global pollutant, which can be transported to the sea by suspended particulate matter (SPM) via rivers constituting the main source of mercury in the southern Baltic sea. The aim of the present study was to characterize the mercury fractions in suspended particulate matter, as well as the transformations of Hg during its riverine transportation into the sea. The thermo-desorption method was used to determine the labile and stable mercury fractions in SPM of rivers (Reda, Zagórska Struga, Gizdepka, Płutnica) within the Baltic Sea basin. In this paper six “periods” were designated (heating, non-heating, drought, rains, downpour/flood and thaws), during which the river suspended particulate matter was enriched with various fractions of mercury. Meteorological and hydrological phenomena such as downpours and thaws intensified surface runoff, causing an increase in the share of Hgabs and Hgads1 mercury fractions in suspended particulate matter. Whereas, droughts contributed to the formation of HgS in a large river and to an inflow of adsorbed Hg in smaller rivers decrease of air temperature leads to increase of fossil fuel combustion and then increases the share of adsorbed Hg (mainly bound with halides) in riverine particulate matter. In the non-heating season, the main fraction was the mercury absorbed inside organic matter.
|Journal series||Environmental Research, ISSN 0013-9351, e-ISSN 1096-0953, (N/A 100 pkt)|
|Publication size in sheets||0.3|
|Keywords in English||labile mercury, rivers, Southern Baltic Sea, meteorological conditions|
|Score||= 100.0, 11-05-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 1.534; : 2018 = 5.026 (2) - 2018=5.051 (5)|
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