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Size distribution of colloidal trace metals and organic carbon during a coastal bloom in the Baltic Sea
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-2276-0564
Institute of Applied Environmental Research (ITM), Stockholm University.
Institute of Applied Environmental Research (ITM), Stockholm University.
Institute of Applied Environmental Research (ITM), Stockholm University.
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2004 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 91, no 1-4, p. 117-130Article in journal (Refereed) Published
Abstract [en]

The physico-chemical speciation of organic carbon and selected metals was measured during a coastal bloom in Ekhagen Bay, Baltic Sea, using ultrafiltration.One important objective with the study was to see if any depletion of trace metals could be measured in the directly bioavailable fraction (<1000 Da, the soluble low molecular weight fraction, LMW) during a plankton bloom. Filters with five different cut-offs were used (1 kD (1000 Da), 5 kD, 10 kD, 100 kD and 0.22 μm) in order to delineate the size distribution of colloidal organic carbon (COC) and trace metals. During the bloom in May, LMW Al, Co, Cu, Mn and Ni concentrations decreased although the colloidal and particulate concentrations were relatively high. Data show that desorption of colloidal and particulate bound trace metals to the LMW fraction was slower than the process depleting the LMW fraction. Estimates of the maximum active uptake of Cu, Ni and Mn by the phytoplankton, and the loss of non-bioactive Al from the LMW fraction, indicate that processes other than active uptake by phytoplankton must contribute to the observed depletion of trace metals in the LMW fraction. Hence, in order to estimate the bioavailable pool of trace metals for plankton during bloom conditions, these other processes must be understood and quantified. Transparent Exopolymeric Particles (TEP, reflecting sugar-rich phytoplankton exudates) increased around eight times during the plankton bloom. We hypothesize that the formation of TEP is a process that might be important for the transfer of trace metals from the LMW to the particulate fraction during the phytoplankton bloom, but the significance of TEP for this depletion in Baltic Sea surface water remains to be shown.

Place, publisher, year, edition, pages
2004. Vol. 91, no 1-4, p. 117-130
National Category
Geochemistry
Research subject
Applied Geology
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URN: urn:nbn:se:ltu:diva-9688DOI: 10.1016/j.marchem.2004.06.009ISI: 000225482800010Scopus ID: 2-s2.0-7444268543Local ID: 859969b0-822b-11db-aabe-000ea68e967bOAI: oai:DiVA.org:ltu-9688DiVA, id: diva2:982626
Note
Validerad; 2004; 20061202 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ingri, JohanRodushkin, Ilia

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