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Dissolution of atmospheric cobalt and zinc in seawater
1Laboratoire des sciences de l'Environnement MARin CNRS UMR6539, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, Technopôle Brest-Iroise 29280 Plouzané, France
2UMR7583/LISA, CNRS/Univerité Paris 7 and Paris 12, Faculté des Sciences et Technologie, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
*now at: Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg (Texel), The Netherlands
Abstract. Atmospheric dust inputs to the open ocean are major source of trace metals bioavailable for the phytoplankton after their dissolution in seawater. Among them, cobalt (Co) and zinc (Zn) are essential for the growth and for the distribution of major phytoplankton taxon such as coccolithophorids and diatoms. The solubility in seawater of Co and Zn present in atmospheric dusts was studied using an open-flow reactor with and without light irradiation. The analyses of cobalt and Zinc were conducted using voltammetric methods and the global elemental composition of dust determined by ICP-AES. This study highlights the role of the dust origin in revealing the solubility characteristics. Higher dust solubility was found for zinc as compared to cobalt. Cobalt in anthropogenic particles is much more soluble in seawater than in natural particles after 2 h of dissolution. Zinc showed opposite solubilities, higher in natural particles than in anthropogenics. This work is a contribution to ongoing studies which focus on the impact of atmospheric inputs of trace metals onto the primary production.
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Citation: Thuróczy, C.-E., Boye, M., and Losno, R.: Dissolution of atmospheric cobalt and zinc in seawater, Biogeosciences Discuss., 6, 10883-10910, 2009. Bibtex EndNote Reference Manager
