Trace metal geochemistry in the western Black Sea. Part 1: Danube and shelf area
In the shelf area of the north-western Black Sea, samples were collected over the water column using manual collection from a rubber boat for the Danube mouth area, pumping for the shallow waters of the shelf and GoFlo bottles for the shelf break area. Samples were filtered under nitrogen flux inside a clean container. Total dissolved concentrations were evaluated for Cd, Pb, Co, Zn, Mn, Ni, Cu, Al and Fe. The low concentrations observed, in particular for Fe, Mn, Co and Al are attributed to the precipitation of hydrated oxides, a consequence of the high pH of the river. Concentrations of the particulate fraction are similar to the world average. The evolution of the total dissolved concentrations within the salinity gradient is discussed. The colloidal fraction was established on a limited number of samples for Cd, Cu, Mn and Fe. The colloidal material may play an important role in the transport and fate of trace metals. The surface distribution of the total dissolved metals on the studied area show a limited influence of the Danube on the concentrations observed for the open sea as most of the riverine flux seems to follow the general circulation to the South-west area.
Bibliographic Reference: Article: Estuarine Coastal Shelf Science (1997)
Record Number: 199810013 / Last updated on: 1998-02-03
Original language: en
Available languages: en