Trace metals in the Göta river estuary |
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| Authors: | Lars-Göran Danielsson Bertil Magnusson Stig Westerlund Kerong Zhang |
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| Institution: | 1. Department of Analytical and Marine Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden;2. University of Göteborg, S-412 96 Göteborg, Sweden |
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| Abstract: | The concentrations of the trace metals Cd, Cu, Fe, Ni, Pb and Zn in the Göta River estuary have been investigated. The following metal fractions have been determined: acid-leachable, dissolved, labile and particulate.The estuary represents a salt wedge type estuary and is situated in a densely populated region of Sweden. The metal concentrations found for the dissolved fraction is in the range of what can be considered as background levels for freshwater. It is difficult to evaluate any estuarine processes other than conservative mixing for Cd, Cu, Ni and Zn. The dissolved levels in the freshwater end member are Cd, 9–25 ngl?1; Cu, 1·1–1·4 μgl?1; Fe, 20–75 μg l?1: Ni, 0·7–0·9 μg l?1: Pb 0·09–0·2 μg l?1; and Zn, 6–7 μg l?1:The results from the acid-leachable fraction show that at high suspended load the particles sediment in the river mouth. The trace metal levels in this fraction are subject to large variations. |
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| Keywords: | trace elements metals estuaries rivers particle transport Sweden coast |
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