CCA-2497 Original Scientific Paper Atmospheric Deposition: A Potential Source of Trace Metal Organic Complexing Ligands to the Marine

The present study confirms the existence of rainwater and seawa-ter soluble metal (Cu, Pb, Cd, Ni and Co) complexing organic ligands associated with end-member aerosol populations. The end member aerosols being representative of a European urban aerosol population (LUAP ¿ Liverpool Urban Aerosol Population), and an aerosol population representative of crustal dominated material (Mesh Saharan dust, collected off the west African coast). The in-vestigations carried out by ACSV (adsorptive cathodic stripping voltammetry) clearly indicated that these end-members were a source of organic complexing ligands for all the considered metals. For LUAP Cu 26%, Pb 55%, Cd 36%, Ni 26 % and Co 27 % of the to-tal seawater soluble fraction was ACSVnon-labile (i.e. that fraction of the dissolved metal which is released after UV irradiation) com-pared to the corresponding values for Saharan dust (Cu 59%, Pb 23%, Cd 56%, Ni 66%, Co 23%). From these studies it was appar-ent that the dissolution for all metals and their respective fractions in both seawater and artificial rainwater was a rapid process wit