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Title: Characterization of iron-polyphenols complexes in seawater
Authors: González González, Aridane 
Pérez-Almeida, Norma 
Arnone, Veronica 
González Santana, David 
González Dávila, Melchor 
Santana Casiano, Magdalena 
UNESCO Clasification: 251002 Oceanografía química
Keywords: Complexation
Organic ligands
Ocean, et al
Issue Date: 2023
Publisher: Servicio de Publicaciones y Difusión Científica de la Universidad de Las Palmas de Gran Canaria (ULPGC) 
Project: Efecto de la Acidificacion Oceanica, la Temperaturay El Contenido de Materia Organica en la Persistencia de Fe(Ii) en El Oceano Atlantico 
Conference: XXI International Iberian Marine Chemistry (SIQUIMAR 2022) 
Abstract: Marine microorganisms like microalgae, can produce organic ligands with the capability to complex trace metals in the ocean such as iron (Fe) and copper (Cu). Among all the possible organic compounds, polyphenols have been measured and identified in the exudates of marine microalgae such as Phaeodactylum tricornutum and Dunaliella tertiolecta. Among all these polyphenols, catechin, sinapic acid, gallic acid and gentisic acid have been studied in terms of Fe complexation via kinetics of formation (kf) and dissociation (kd). The kf of these organic ligands was 1.2x104 - 4.2x105 M−1 s−1 and kd was 1.8x10−4 - 4.4x10−4 s−1. Therefore, the conditional stability constant (log K′Fe′L) was from 7.8 to 9.2. Then, these polyphenols can be considered weak ligands (L2-type). These results demonstrated that the microalgae can excrete functional groups to complex Fe in seawater, increasing its solubility and keeping for longer in solution. This work improves our knowledge about the Fe biogeochemical cycle and characterizes the pool of organic matter in terms of interactions with Fe.
ISBN: 978-84-9042-478-0
Source: Abstracts XXI International Iberian Marine Chemistry (SIQUIMAR 2022) / coordinación, María Esther Torres Padrón, p. 35
Appears in Collections:Ponencias
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