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Title: Influence of coastal processes on the organic complexation of iron and copper in the Macaronesia region
Authors: Arnone, Veronica 
González Santana, David 
González Dávila, Melchor 
González González, Aridane 
Santana Casiano, Magdalena 
UNESCO Clasification: 251002 Oceanografía química
Keywords: Iron
Organic ligands
Cathodic stripping voltammetry
Coastal water
Issue Date: 2023
Publisher: Servicio de Publicaciones y Difusión Científica de la Universidad de Las Palmas de Gran Canaria (ULPGC) 
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 Temperaturay 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 
Conference: XXI International Iberian Marine Chemistry (SIQUIMAR 2022) 
Abstract: Coastal environments around islands are characterized by the combination of physical, chemical, and biological interactions, such as water mixing, wind stress, dust deposition, and resuspension from sediments that have impacts on the biogeochemistry of trace metals like iron (Fe) and copper (Cu). Therefore, the coastal waters and the influences of their processes on the organic complexation of Fe and Cu have to be studied to fully understand the biogeochemical cycles of these metals in the marine environment. Dissolved iron (dFe) and copper (dCu), the concentration and the conditional stability constants of organic binding ligands (LFe, LCu, log Kcond Fe3+L and log Kcond Cu2+L) were studied in the surface coastal waters of the Macaronesia region (Cape Verde, Canary Islands, and Madeira). Samples were collected during the POS533 cruise (2019) and analysed by competitive ligand exchange adsorptive cathodic stripping voltammetry. More than 98% of dFe (0.46-1.32 nM) was organically complexed with LFe, whose concentration range was between 0.56-2.96 nM. The logKcond Fe3+L presented values between 20.77 and 21.90 (L2-type ligands). In the case of dCu (0.07-4.03 nM), more than 99% was complexed and LCu concentration was in the range of 0.54-2.59 nM. The logKcond showed values between 13.40 and 14.42 (L1-type ligands). The results suggest that, along the region, physical processes related to the water mixing could influence Fe and Cu speciation. Dissolved metals and ligand concentrations were greater at the coastal stations than in oceanic water related to biological activity and water mixing induced by the wind. Furthermore, greater concentrations were observed on the eastern parts of Fogo, Tenerife and Gran Canaria than on the western coast, due to stronger wind incidence.
ISBN: 978-84-9042-478-0
Source: Abstracts XXI International Iberian Marine Chemistry (SIQUIMAR 2022) / coordinación, María Esther Torres Padrón, p. 16-17
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