| Summary: | Physicochemical speciation of iron (Fe) and the trace metals Cd, Cu, Co, Mn, Ni, and Zn were performed at four different locations in surface waters of the Baltic Sea. Measurements were performed during several months of the growth season at each station to obtain a detailed picture of the temporal variation in relation to phytoplankton growth. The main target was to understand the speciation of iron, and to evaluate if Fe was limiting in primary production. A methodological aim of the thesis work was focused on comparison between trace metal speciation methods; where the DGT method was calibrated to other methods and also to use the DGT method find out which mechanisms that control the labile fraction. Other methods, such as CSV, CL-FIA and Fe isotope measurements (MC-ICP-MS) were used to further evaluate the changes in the Fe fractions.Concentrations of Mn, Zn and Cd measured by DGT during 2003 and 2004 were similar to concentrations measured in Godkänd; 2009; 20090827 (jgn); DISPUTATION Ämnesområde: Tillämpad geologi/Applied Geology Opponent: Dr Peter Croot, Leibniz Institut Für Meereswissenschaften, Tyskland Ordförande: Professor Johan Ingri, Luleå tekniska universitet Tid: Fredag den 25 september 2009, kl 10.00 Plats: F 341, Luleå tekniska universitet
|
|---|