The University of Southampton
University of Southampton Institutional Repository

The biogeochemistry of some trace metals in some eutrophic areas: the Adriatic sea and the North-Western black sea

The biogeochemistry of some trace metals in some eutrophic areas: the Adriatic sea and the North-Western black sea
The biogeochemistry of some trace metals in some eutrophic areas: the Adriatic sea and the North-Western black sea
In the northern Adriatic and north western Black Sea, relatively high concentrations of nutrients inducing eutrophication, have been observed. The biodegradation of organic matter, which occurred below the thermocline or at the sediment-water interface, influence the reduction-oxidation potential in the water column. Fluctuation of the reduction-oxidation potential in the water column influence the distribution of metals which are redox sensitive elements (Mn, Fe and Co). Dissolved Mn and Fe concentrations were high in some cases mainly due to the reduction of Mn- and Fe- oxides which occurred in microenvironments in the dominantly oxic medium at the thermocline or in low O2 zones near the bottom. The distributions were also influenced by riverine inputs. Dissolved Mn, Fe and Co concentrations were generally higher in the north-western Black Sea than in the Adriatic Sea suggesting that diagenetic reactions involving the destruction of organic carbon are more intense in the north-western Black Sea than in the Adriatic Sea. Total particulate concentrations of Mn and Fe were high, due to reprecipitation of Mn2+ and Fe2+ in presence of oxygen, riverine inputs and advective transport. Trace metal distributions (Co, Pb, Cd, Zn, Cu, Ni) were influenced by the Mn and Fe cycling and by riverine inputs. Relatively high dissolved and leachable or total particulate concentrations were generally found in surface waters at stations directly influenced by the River Po and the River Danube. High dissolved metal concentrations were found at the thermocline or near the sediment-water interface where dissolution of Mn- and Fe- oxides, on which metals were adsorbed, occurs under suboxic or anoxic conditions. Dissolved concentrations of Pb, Cd, Cu, Ni and Zn are generally similar in the northern Adriatic Sea and in the north-western Black Sea. Particulate Fe, Pb, Ni, Cd and Zn concentrations were higher in the northern Adriatic Sea than in the north-western Black Sea reflecting the strong influence of riverine inputs on the shallow northern part of the Adriatic where the depth hardly ever exceeds 40 m.

Tankere, S.P.C.
f289457e-0cde-4be2-aa58-7075f5a57851
Tankere, S.P.C.
f289457e-0cde-4be2-aa58-7075f5a57851
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c

Tankere, S.P.C. (1998) The biogeochemistry of some trace metals in some eutrophic areas: the Adriatic sea and the North-Western black sea. University of Southampton, Oceanography, Doctoral Thesis, 313pp.

Record type: Thesis (Doctoral)

Abstract

In the northern Adriatic and north western Black Sea, relatively high concentrations of nutrients inducing eutrophication, have been observed. The biodegradation of organic matter, which occurred below the thermocline or at the sediment-water interface, influence the reduction-oxidation potential in the water column. Fluctuation of the reduction-oxidation potential in the water column influence the distribution of metals which are redox sensitive elements (Mn, Fe and Co). Dissolved Mn and Fe concentrations were high in some cases mainly due to the reduction of Mn- and Fe- oxides which occurred in microenvironments in the dominantly oxic medium at the thermocline or in low O2 zones near the bottom. The distributions were also influenced by riverine inputs. Dissolved Mn, Fe and Co concentrations were generally higher in the north-western Black Sea than in the Adriatic Sea suggesting that diagenetic reactions involving the destruction of organic carbon are more intense in the north-western Black Sea than in the Adriatic Sea. Total particulate concentrations of Mn and Fe were high, due to reprecipitation of Mn2+ and Fe2+ in presence of oxygen, riverine inputs and advective transport. Trace metal distributions (Co, Pb, Cd, Zn, Cu, Ni) were influenced by the Mn and Fe cycling and by riverine inputs. Relatively high dissolved and leachable or total particulate concentrations were generally found in surface waters at stations directly influenced by the River Po and the River Danube. High dissolved metal concentrations were found at the thermocline or near the sediment-water interface where dissolution of Mn- and Fe- oxides, on which metals were adsorbed, occurs under suboxic or anoxic conditions. Dissolved concentrations of Pb, Cd, Cu, Ni and Zn are generally similar in the northern Adriatic Sea and in the north-western Black Sea. Particulate Fe, Pb, Ni, Cd and Zn concentrations were higher in the northern Adriatic Sea than in the north-western Black Sea reflecting the strong influence of riverine inputs on the shallow northern part of the Adriatic where the depth hardly ever exceeds 40 m.

Text
00076340.pdf - Other
Download (10MB)

More information

Published date: 1998
Organisations: University of Southampton, Ocean and Earth Science

Identifiers

Local EPrints ID: 361579
URI: http://eprints.soton.ac.uk/id/eprint/361579
PURE UUID: 3af918b7-4984-4c66-ad7f-4066549a0366

Catalogue record

Date deposited: 27 Jan 2014 15:30
Last modified: 14 Mar 2024 15:53

Export record

Contributors

Author: S.P.C. Tankere
Thesis advisor: Peter J. Statham

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×