Distribution of phosphorus and heavy metals in the sediments of lake arendsee (Altmark, Germany)

• Autorzy: Zachmann, D.W. , van der Veen, A. , Muller, S.
• Języki publikacji: EN

Abstrakty

EN

Lake Arendsee is a dimictic lake with a surface area of about 5 km2 and a maximum depth of about 50 m. Due to the input of untreated sewage rich in P the lake turned to eutrophic state in the 1950s. Sediment cores were taken by different methods: short cores (0-50 cm) with a gravity corer, long cores (0-160 cm) with a piston corer. The sediments were sliced into subsamples under argon atmosphere in a glove box. The samples were analysed by ICP-OES and ICP-MS on main and trace elements after digestion in either aqua regia or HF-HNO3-HClO4. Analogous cores were dated by varve counting and radiometric methods. The enforced build-up of industry and agriculture since the 1950s is displayed in the sediment composition. The P concentrations increase from a background of about 600 ppm (oligotrophic state of the lake) to more than 4,000 ppm in a depth of 14 cm, which corresponds to the 1970s. In 1976, a hypolimnetic withdrawal and a sewage plant were built. Above the corresponding depth the concentrations of P and heavy elements decrease in the sediments but are still by far higher than the background values. The bonding form analyses dokument mineral equilibration by diagenetic processes. Stable sulfidic bonding forms become predominant with increasing depth.

Słowa kluczowe

EN

phosphorus; lake sediments; heavy metals; sequential extraction; Arendsee lake

• Czasopismo: Studia Quaternaria
• Rocznik: 2004
• Tom: Vol. 21
• Strony: 179-185
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Zachmann, D.W.

• Technical University of Braunschweig, Institute of Environmental Geology, Geochemistry, Pockelsstraße 4, 38106 Braunschweig, Germany,

autor

van der Veen, A.

• UFZ-Centre for Environmental Research, Dept. of River Ecology, Brückstraße 3a, 39114 Magdeburg, Germany,

autor

Muller, S.

• Technical University of Braunschweig, Institute of Environmental Geology, Geochemistry, Pockelsstraße 4, 38106 Braunschweig, Germany

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