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http://hdl.handle.net/10553/113980
Título: | Iron and copper complexation in Macaronesian coastal waters | Autores/as: | Arnone, Veronica González Santana, David González Dávila, Melchor González González, Aridane Santana Casiano, Juana Magdalena |
Clasificación UNESCO: | 251010 Procesos litorales o sublitorales 230220 Química microbiológica |
Palabras clave: | Coastal Waters Copper Iron Macaronesian Region Organic Ligands |
Fecha de publicación: | 2022 | Proyectos: | 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 |
Publicación seriada: | Marine Chemistry | Resumen: | 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. | URI: | http://hdl.handle.net/10553/113980 | ISSN: | 0304-4203 | DOI: | 10.1016/j.marchem.2022.104087 | Fuente: | Marine Chemistry [ISSN 0304-4203], v. 240, 104087, (Marzo 2022) |
Colección: | Artículos |
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