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  • 1.
    Jonsson, Anders
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Fe and Al sedimentation and their importance as carriers for P, N and C in a large humic lake in northern Sweden1997In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 99, no 1-4, p. 283-295Article in journal (Refereed)
    Abstract [en]

    The sedimentation of organic, amorphous oxides, crystalline oxides and crystalline silicate species of Fe and Al was investigated in humic Lake Ortrasket. The covariation with C, N and P sedimentation also was studied. The results showed a strong temporal variation in the occurrence of different Fe species. During high discharge, such as in spring, Fe mostly occurred as crystalline Fe-silicate species, while the amorphous form dominated at other times of the year. Al generally sedimented as crystalline Al-silicate species (95%). Amorphous Fe species showed a strong relation with organic C and N, suggesting an association between organic material and amorphous Fe oxides. P was not as strongly related to amorphous Fe, probably as a result of apatite or clay bound-P species sedimentation.

  • 2. Rentz, Ralf
    et al.
    Widerlund, Anders
    Viklander, Maria
    Ohlander, Bjorn
    Impact of Urban Stormwater on Sediment Quality in an Enclosed Bay of the Lule River, Northern Sweden2011In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 218, no 1-4, p. 651-666Article in journal (Refereed)
    Abstract [en]

    Sediment and porewater samples from an enclosed bay receiving stormwater discharge (Skutviken) near the centre of LuleAyen, northern Sweden were analysed for major and trace elements and 16 polycyclic aromatic hydrocarbons (PAHs). Among the studied metals Cd, Cu, Pb and Zn were enriched at Skutviken. Also, the PAH content was enriched, in particular for phenantrene, anthracene, fluoranthene and pyrene which are regarded as common constituents in stormwater. The use of trace metal ratios provided indications about pollutant sources for the sediment. Cs-137 dating was used to determine historical changes in metal and PAH fixation in the sediment. The bay Skutviken is enclosed through the construction of a road bank since 1962. The enclosure led to reduced water circulation in the bay that promotes the occurrence of anoxic conditions with sulphate reduction within the bay. As a consequence of these conditions, metals are trapped in the sediments as sulphides. This study suggests that enclosed bays with restricted water circulation may be efficient traps for urban pollutants, reducing the present-day input of pollutants to the sea. In areas with postglacial land uplift, where such bays are common, bay sediments are a potential future source of pollutants when uplift results in erosion and oxidation of the sediments.

  • 3. Rodushkin, Ilia
    et al.
    Engstrom, Emma
    Sorlin, Dieke
    Baxter, Douglas
    Hörnfeldt, Birger
    Nyholm, Erik
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Ecke, Frauke
    Uptake and Accumulation of Anthropogenic Os in Free-Living Bank Voles (Myodes glareolus)2011In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 218, no 1-4, p. 603-610Article in journal (Refereed)
    Abstract [en]

    Osmium tetroxide (OsO4) is one of the most toxic air contaminants but its environmental effects are poorly understood. Here, for the first time, we present evidence of osmium uptake in a common herbivore (bank vole, Myodes glareolus) in boreal forests of northern Sweden. Voles (n = 22) and fruticose arboreal pendular lichens, the potential main winter food source of the vole, were collected along a spatial gradient to the west of a steelwork in Tornio, Finland at the Finnish-Swedish border. Os-187/Os-188 isotope ratios increased and osmium concentrations decreased in lichens and voles along the gradient. Osmium concentrations in lichens were 10,000-fold higher than those in voles. Closest to the steelwork, concentrations were highest in kidneys rather than skin/fur that are directly exposed to airborne OsO4. The kidney-to-body weight ratio was higher at the two localities close to the steelwork. Even though based on a small sample size, our results for the first time demonstrate that osmium is taken up, partitioned, and accumulated in mammal tissue, and indicate that high kidney-to-body weight ratios might be induced by anthropogenic osmium.

  • 4. Swietlik, Joanna
    et al.
    Laskowski, Tomasz
    Kozyatnyk, Ivan
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Adsorption of Natural Organic Matter onto the Products of Water-Pipe Corrosion2015In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 226, no 7, article id 225Article in journal (Refereed)
    Abstract [en]

    Natural organic matter (NOM) interaction with corrosion sediments is important because it can adversely affect the behaviour of many organic and inorganic pollutants in drinking water distribution systems. NOM accumulation onto corrosion sediments can cause serious problems for water supply, such as bacteria regrowth and deterioration of water quality. Corrosion sediments have different structures from the well-known iron oxides. The interaction among corrosion sediments and water organic matter can also differ. The main goal of this work was to understand the adsorption mechanism of the processes of NOM interaction with corrosion sediments. Fulvic acid (FA) isotherms on corrosion sediments in logarithmic coordinates of the Freundlich equation have different segments with different slopes, representing the non-adsorbed and adsorbed conditional component of the FA. The formation of structures with a molecular weight higher than the initial FA was observed. FA adsorption on corrosion sediments depends on time. Almost 60-70 % of the FA was removed during the first 10 min of contact. Such rapid adsorption indicates that FA was accumulated onto corrosion sediments mainly due to physical-chemical interaction. The pseudo-second-order kinetics model was demonstrated to better describe the adsorption of FA onto corrosion sediments than the pseudo-first-order model. External mass transfer is the limiting stage of the process of FA adsorption onto corrosion sediments. This knowledge is useful for understanding of corrosion processes and biological regrowth in water supply pipes and thus further decrease of drinking water quality.

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