En la semana del 22 al 27 de Junio de 2021, el grupo QUIMA (IOCAG, ULPGC) participó en el ASLO 2021 Aquatic Sciences Meeting celebrado en formato virtual.
En este congreso internacional, la investigadora predoctoral Veronica Arnone presentó un trabajo titulado: The influence of coastal
waters on the organic complexation of iron and copper in the Macaronesia region.
El resumen del trabajo es el siguiente y se puede consultar en este link:
The concentration of dissolved iron
(dFe), copper (dCu) and metal binding ligands (LFe and LCu) in the
vicinity of oceanic islands are influenced by a dynamic environment with
complex interactions between the topography and the general water circulation
that overlap the usual sources. During the POS533 cruise (February to March
2019) surface samples from coastal and oceanic waters were taken in the
Macaronesia region (Cape Verde, Canary Islands and Madeira). The competitive
ligand exchange adsorptive cathodic stripping voltammetry was the technique
used to evaluate the concentration and binding strength of metals and binding
ligand. In the region, more than 98% of dFe (0.46-1.32 nM) was organically
complexed with LFe (0.56-2.96 nM). The
conditional stability constant (logKcondFe3+L) presented values between 20.77 and
21.90. In the case of dCu (0.07-4.03 nM), more than 99% was complexed with LCu (0.54-2.59 nM). The conditional stability
constant (logKcondCu2+L) showed values between 13.40 and 14.42. Fe and Cu ligands
concentrations overlap in many stations suggesting a common source of ligand or
that at least some of these are not specific to a single metal. The processes
that take place around the islands enhance the concentrations dissolved metals
and ligands compared to the values observed in the open ocean. In addition, it
has been observed that the increase in concentrations on the east coasts could
be related with a greater incidence of wind and dynamic processes.
