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Different metals (Cr, Cu, Fe, Zn, Pb and Ni) were dosed by spectrophotometry of atomic absorption in the North Sea waters and the Scheldt estuary. For some amongst them, a comparison is made between the dosage by spectrophotometry atomic absorption and the measurements by neutron activation. Copper and zinc were dosed in the organisms of three fish common in the North Sea (Pleuronectes platessa, Gadus merlangus and Trachurus trachurus).Its results were put into a report together with its contents and nutrient salts (nitrates, nitrites and phosphates) in the same waters.