Trace metal fronts in Scottish coastal waters |
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| Authors: | P W Balls |
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| Institution: | Department of Agriculture and Fisheries for Scotland, Marine Laboratory, P.O. Box 101, Victoria Road, Aberdeen AB9 8DB, U.K. |
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| Abstract: | Dissolved cadmium and copper concentrations have been determined in 76 surface water samples in coastal and ocean waters around Scotland by anodic stripping voltammetry (ASV). A trace metal/salinity ‘front’ is observed to the west, north and north-east of Scotland separating high salinity ocean water (>35 × 10−3) with low concentrations of dissolved Cd and Cu from lower salinity (<35 × 10−3) coastal water containing higher concentrations of Cd and Cu. Mean Cd concentrations in ocean and coastal waters are 7 ng dm−3 (0·06 n
) and 11 ng dm−3 (0·10 n
) respectively; for Cu the respective levels are 60 ng dm−3 (0·95 n
) and 170 ng dm−3 (2·68 n
). The observed distribution is attributed principally to freshwater runoff and the advection of contaminated Irish Sea water into the study area. |
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| Keywords: | trace elements copper cadmium fronts coastal waters |
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