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Title: Iron and copper complexation in Macaronesian coastal waters
Authors: Arnone, Veronica 
González Santana, David
González Dávila, Melchor 
González González, Aridane 
Santana Casiano, Juana Magdalena 
UNESCO Clasification: 251010 Procesos litorales o sublitorales
230220 Química microbiológica
Keywords: Coastal Waters
Macaronesian Region
Organic Ligands
Issue Date: 2022
Project: Our common future ocean in the Earth system ¿ quantifying coupled cycles of carbon, oxygen, and nutrients for determining and achieving safe operating spaces with respect to tipping points 
Efecto de la Acidificacion Oceanica, la Temperatura y El Contenido de Materia Organica en la Persistencia de Fe(Ii) en El Oceano Atlantico 
Planificación Conjunta, Seguimiento y Observación, Mejora del Conocimiento y Sensibilización Ante Riesgos y Amezas del Cambio Climatico en la Macaronesia 
Journal: Marine Chemistry 
Abstract: Dissolved iron (dFe) and copper (dCu), the concentration and the conditional stability constants of organic binding ligands (LFe, LCu, log KcondFe3+L and log KcondCu2+L) were studied in the surface coastal waters of the Macaronesia region (Cape Verde, Canary Islands, and Madeira) using competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV). Two oceanic stations were also studied: the Cape Verde Ocean Observatory (CVOO) and the European Station for Time Series in the Ocean in the Canary Islands (ESTOC). Dissolved Fe varied from 0.46 to 1.32 nM and LFe concentrations were between 0.56 and 2.96 nM. More than 98% of the total dFe was complexed with conditional stability constants (log KcondFe3+L) between 20.77 and 21.90 (L2-type ligands). Dissolved Cu concentrations ranged between 0.07 and 4.03 nM and the amount of LCu varied between 0.54 and 2.59 nM, with more than 99% of dCu organically complexed. The conditional stability constant (log KcondCu2+L) showed values between 13.40 and 14.42 (L1-type). Due to biological activity and water mixing induced by the wind around the islands, dissolved metals and ligand concentrations were greater at the coastal stations than in oceanic water. Variations were observed between the eastern and western parts of Fogo, Tenerife and Gran Canaria. On the east coasts, the increase in dissolved metals and ligand concentrations were related to wind-induced water mixing. The results of this study will contribute to the knowledge about the impact of coastal areas on the Fe and Cu biogeochemical cycles.
ISSN: 0304-4203
DOI: 10.1016/j.marchem.2022.104087
Source: Marine Chemistry [ISSN 0304-4203], v. 240, 104087, (Marzo 2022)
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