The distribution of Mn, Fe, Zn, Cd and Cu in Baltic seawater; a study on the basis of one anchor station

Kremling, Klaus and Petersen, Harald (1978) The distribution of Mn, Fe, Zn, Cd and Cu in Baltic seawater; a study on the basis of one anchor station Marine Chemistry, 6 (2). pp. 155-170. DOI 10.1016/0304-4203(78)90025-7.

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Abstract

A total of 150 samples were collected at a 10-days' anchor station in the Bornholm basin (55° 31.1'N, 15° 32.1'E) and analyzed for dissolved (< 0.4 [mu]m) and particulate trace metals. For dissolved Mn, large gradients have been found in the vertical distribution with minimum concentrations (< 0.2 [mu]gl-1) in the halocline zone and considerably higher values in the deep waters (up to 50 [mu]gl-1). Ultrafiltration studies indicate that dissolved Mn is probably present as Mn2+ in the oxygenated bottom layer. The primary production process was not evident in the particulate Mn profile; the suspended particulate material (SPM), however, shows a considerable enrichment with depth, apparently due to Mn-oxide precipitation. The distribution of dissolved Fe was rather homogeneous, with average concentrations throughout the water column between 0.86 and 1.1 [mu]gl-1, indicating that the oxidation of Fe2+ ions released from the sediments must already be complete in the very near oxidation boundary layer. Relatively high concentrations of particulate Fe were actually measured in the bottom layer, with the maximum mean of 11.2 [mu]gl-1 at 72 m. Similarly to Mn, the profile of particulate Fe does not reflect the SPM curve of the eutrophic layer. On average, about 70% of the total Fe in surface waters was found to be particulate. The average concentrations of dissolved Zn, Cd and Cu were found to be rather homogeneous in the water column but showed a relatively high variability with time. A simplified model on trace-metal uptake by phytoplankton indicates no significant change in dissolved metal concentrations during the period of investigation. On average, only 1.7% Zn, 3.3% Cd and 9.8% Cu of the total metal concentrations were found in particulate form. SPM analyses showed significant correlations of Zn, Cd and Cu with Fe, indicating that particulate iron is an important carrier for particulate trace metals in Baltic waters.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/0304-4203(78)90025-7
ISSN: 0304-4203
Date Deposited: 25 Feb 2012 06:55
Last Modified: 08 Oct 2012 10:42
URI: http://eprints.uni-kiel.de/id/eprint/16399

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