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Heavy metal pollution in Wellington Harbour
Authors:P Stoffers  G P Glasby  C J Wilson  K R Davis  P Walter
Institution:1. Institut für Sedimentforschung , Universit?t Heidelberg , Postfach 10 30 20, Heidelberg, D‐6900, Federal Republic of Germany;2. New Zealand Oceanographic Institute, Department of Scientific and Industrial Research , Private Bag, Kilbirnie, Wellington, New Zealand;3. Wellington Regional Council , P. O. Box 27–242, Wellington, New Zealand
Abstract:Heavy metal analysis of the < 20 μm fraction of marine sediments from Wellington Harbour and Waiwhetu Stream have shown that the Waiwhetu Stream is easily the most polluted area in the Wellington Harbour system with Pb and Zn in the extremely polluted category and Cu, Cd, and Hg in the moderately to strongly polluted category. These elements have different distributions in the stream sediments reflecting their different sources from adjacent factories. In Wellington Harbour itself, the central basin of the harbour suffers from minimal pollution. Pb, and to a lesser extent Zn and Cu, are the main pollutants and local enrichment of these elements is noted in Lambton Harbour basin, off Pencarrow and Moa Point outfalls, in Evans Bay, and off Petone and Kaiwharawhara. The geochemical data do not enable us to identify the source of the pollutants unambiguously. A summary of the history of waste discharges into the harbour suggests that heavy metal pollution may have been higher in the past.
Keywords:heavy metals  pollution  Wellington Harbour  New Zealand  lead  zinc  copper  cadmium  mercury
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