Vertical distribution of mercury in the Krka river estuary

摘要

The concentrations of reactive and total mercury (in the UV-irradiated samples) were measured in unfiltered and acidified samples by atomic absorption. The samples were collected in the vertical profile on one selected station in the Krka river estuary (Croatia) during 1997-2000. The estuary is permanently stratified and characterized by the subsurface temperature maxima. The maximum concentrations of reactive and total mercury range from 0.9 to 3.3 ng L~(-1), and from 1.3 to 6.0 ng L~(-1), respectively. The vertical transport of mercury across the picnocline is enhanced under the influence of a north wind.