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Introduction
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Publications
Publications (15)
Ocean acidification impacts the iron (Fe) biogeochemistry both by its redox and its complexation reactions. This has a direct effect on the ecosystems due to Fe being an essential micronutrient. Polyphenols exudated by marine microorganisms can complex Fe(III), modifying the Fe(II) oxidation rates as well as promoting the reduction of Fe(III) to Fe...
Phenolic compounds excreted by marine microalgae are part of the ligand pool in natural waters. The effect of the polyphenol gentisic acid (GA; 2,5 dihydroxybenzoic acid) on the Fe(III) reduction as a function of organic ligand concentration (100 nM – 1000 nM) and the pH (7.00–8.01) was investigated in seawater. Major seawater ions interactions wit...
The redox interaction between iron and copper was experimentally studied in UV-seawater (UV-SW) and a kinetic model was developed to simultaneously reproduce the coupled Fe and Cu redox chemistry. The kinetic model included a combination of chemical reactions and their equilibrium and rate constants. The interactions between Cu(I) and Fe(II), Cu(I)...
Over the past few decades, there has been an increase in the number of research studies focused on all aspects of the ecology, physiology, biochemistry, cell biology, molecular biology, systematics and uses of algae. This chapter will provide an overview of the potential human health advantages associated with the use of algae as a source of high-v...
The role played by the natural organic ligands excreted by the green algae Dunaliella tertiolecta on the Fe(II) oxidation rate constants was studied at different stage of growth. The concentration of dissolved organic carbon increased from 2.1 to 7.1 mgL-1 over time of culture. The oxidation kinetics of Fe(II) was studied at nanomolar levels and un...
The extracts of six common plants from the Canary Islands were screened for their antioxidant activities and compared with several phenolic compounds of natural origin (quercetin, catechin, rutin and gentisic acid) and synthetic (butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT)). The in vitro antioxidant activity determined by usin...
The oxidation of nanomolar copper(I) at low oxygen (6 µM) concentrations was studied as a function of pH (6.7-8.2), ionic strength (0.1-0.76 M), total inorganic carbon concentration (0.65-6.69 mM) and the added concentration of hydrogen peroxide, H2O2 (100-500 nM) over the initial 150 nM H2O2 concentration in the coastal seawater. The competitive e...
Fe(II) oxidation kinetics were studied in seawater and in seawater enriched with exudates excreted by Phaeodactylum tricornutum as an organic ligand model. The exudates produced after 2, 4, and 8 days of culture at 6.21 × 107, 2.29 × 108, and 4.98 × 108 cell L–1 were selected. The effects of pH (7.2–8.2), temperature (5–35 ºC), and salinity (10–36....
Fe(II) oxidation kinetics were studied in seawater and in seawater enriched with exudates excreted by Phaeodactylum tricornutum as an organic ligand model. The exudates produced after 2, 4, and 8 days of culture at 6.21 x 10(7), 2.29 x 10(8), and 4.98 x 10(8) cell L-1 were selected. The effects of pH (7.2-8.2), temperature (5-35 °C), and salinity (...
The Fe(II) oxidation kinetic was studied in seawater enriched with nutrients as a function of pH (7.2-8.2), temperature (5-35 °C), and salinity (10-36.72) and compared with the same parameters in seawater media. The effect of nitrate (0-1.77 × 10(-3) M), phosphate (0-5.80 × 10(-5) M) and silicate (0-2.84 × 10(-4) M) was studied at pH 8.0 and 25 °C....
The oxidation and reduction of nanomolar levels of copper in air-saturated seawater and NaCl solutions has been measured as a function of pH (7.17–8.49), temperature (5–35 °C) and ionic strength (0.1–0.7 M). The oxidation rates were fitted to an equation valid at different pH and ionic strength conditions in sodium chloride and seawater solutions:l...
The oxidation and reduction of nanomolar levels of copper in air-saturated seawater and NaCl solutions has been measured as a function of pH (7.17–8.49), temperature (5–35 °C) and ionic strength (0.1–0.7 M). The oxidation rates were fitted to an equation valid at different pH and ionic strength conditions in sodium chloride and seawater solutions:...
Projects
Projects (2)
The ATOPFe Project will study the effects of pH, temperature, and organic matter (TOC) on Fe (II) oxidation kinetics and its persistence in the ocean. Three specific regions: polar, subtropical and submarine volcanic regions, have been selected as the fundamental basis for comparing laboratory studies and developing a kinetic model for iron in the context of ocean acidification and warming.
The main goal of the EACFe project is to investigate which compounds and mechanisms determine the presence of Fe(II) in the marine environment and how the presence of organic matter, ocean acidification and global warming affect them.
The main goals of the EACFe project is to investigate which compounds and mechanisms determine the presence of Fe(II) in the marine environment and how ocean acidification and global warming affect them.
To achieve these goals we will combine the studies in the Atlantic Subarctic region, one of the most sensitive to ocean acidification, with studies in the lab using individual organic compounds and the exudates from cultures of phytoplankton. In the lab studies we will consider the different variables independently in order to define the contribution of each one to the process.
