Dissolved and particulate trace metals in surface waters over the Dogger Bank, Central North Sea

Samples of surface water were collected from 14 stations over the southern Dogger Bank and the Outer Silver Pit in November 1989. Analyses were carried out for dissolved Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb by solvent extraction followed by graphite furnace atomic absorption spectrophotometry (GFAAS), and for Hg (total and reactive) by cold vapour AAS (CVAAS). Samples of suspended particulate material, isolated by filtration were analysed for Al, Cr, Ni, Cu, Zn, Cd, and Pb by GFAAS following digestion with hydrofluoric acid, and for Hg by atomic fluorescence following digestion with concentrated nitric and hydrochloric acids.