Browsing Química by Author "Achterberg, Eric P."
Now showing items 1-15 of 15
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Acid-base properties of dissolved organic matter extracted from the marine environment
Lodeiro, Pablo; Rey Castro, Carlos; David, Calin; Achterberg, Eric P.; Puy Llorens, Jaume; Gledhill, Martha (Elsevier, 2020-08-10)Marine dissolved organic matter (DOM) plays a key role in the current and future global carbon cycle, which supports life on Earth. Trace metals such as iron, an essential micronutrient, compete with protons and major ions ... -
Arctic - Atlantic Exchange of the Dissolved Micronutrients Iron, Manganese, Cobalt, Nickel, Copper and Zinc With a Focus on Fram Strait
Krisch, Stephan; Hopwood, Mark J.; Roig, Stéphane; Gerringa, Loes J. A.; Middag, Rob; Rutgers van der Loeff, Michiel; Petrova, Mariia V.; Lodeiro, Pablo; Colombo, Manuel; Cullen, Jay T.; Jackson, Sarah L.; Heimbürger-Boavida, Lars-Eric; Achterberg, Eric P. (Wiley; American Geophysical Union, 2022-04-28)The Arctic Ocean is considered a source of micronutrients to the Nordic Seas and the North Atlantic Ocean through the gateway of Fram Strait (FS). However, there is a paucity of trace element data from across the Arctic ... -
Detection of silver nanoparticles in seawater at ppb levels using UV-visible spectrophotometry with long path cells
Lodeiro, Pablo; Achterberg, Eric P.; El-Shahawi, Mohammad S. (Elsevier, 2017-03-01)Silver nanoparticles (AgNPs) are emerging contaminants that are difficult to detect in natural waters. UV-visible spectrophotometry is a simple technique that allows detection of AgNPs through analysis of their characteristic ... -
Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters
Lodeiro, Pablo; Achterberg, Eric P.; Rey Castro, Carlos; El-Shahawi, Mohammad S. (Elsevier, 2018-08-01)The aggregation behaviour of polymer-coated silver nanoparticles (AgNPs) was characterized in NaCl solutions, and in two seawaters of different salinities and dissolved organic matter (DOM) contents. Representative organic ... -
Iron Speciation in Fram Strait and Over the Northeast Greenland Shelf: An Inter-Comparison Study of Voltammetric Methods
Ardiningsih, Indah; Zhu, Kechen; Lodeiro, Pablo; Gledhill, Martha; Reichart, Gert-Jan; Achterberg, Eric P.; Middag, Rob; Gerringa, Loes J. A. (Frontiers Media, 2021-01-21)Competitive ligand exchange - adsorptive cathodic stripping voltammetry (CLE-AdCSV) is a widely used technique to determine dissolved iron (Fe) speciation in seawater, and involves competition for Fe of a known added ligand ... -
Mechanisms of silver nanoparticle toxicity to the coastal marine diatom Chaetoceros curvisetus
Lodeiro, Pablo; Browning, Thomas J.; Achterberg, Eric P.; Guillou, Aurélie; El-Shahawi, Mohammad S. (Springer Nature, 2017-09-07)Inputs of silver nanoparticles (AgNPs) to marine waters continue to increase yet mechanisms of AgNPs toxicity to marine phytoplankton are still not well resolved. This study reports a series of toxicity experiments on a ... -
Mercury species export from the Arctic to the Atlantic Ocean
Petrova, Mariia V.; Krisch, Stephan; Lodeiro, Pablo; Valk, Ole; Dufour, Aurelie; Rijkenberg, Micha J.A.; Achterberg, Eric P.; Rabe, Benjamin; Rutgers van der Loeff, Michiel; Hamelin, Bruno; Sonke, Jeroen E.; Garnier, Cédric; Heimbürger-Boavida, Lars-Eric (Elsevier, 2020-09-10)The Fram Strait is the only deep connection between the Arctic and Atlantic Oceans. The main water and mercury (Hg) fluxes between these oceans occur via the Fram Strait and Barents Sea Opening. Several Hg mass balance ... -
Optimization of hyphenated asymmetric flow field-flow fractionation for the analysis of silver nanoparticles in aqueous solutions
Geißler, Felix; Martínez-Cabanas, María; Lodeiro, Pablo; Achterberg, Eric P. (Springer, 2021-09-19)The extensive use of silver nanoparticles (AgNPs) in consumer products, medicine, and industry leads to their release into the environment. Thus, a characterization of the concentration, size, fate, and toxicity of AgNPs ... -
Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
Krisch, Stephan; Huhn, Oliver; Al-Hashem, Ali; Hopwood, Mark J.; Lodeiro, Pablo; Achterberg, Eric P. (John Wiley and Sons Inc., 2022)Concentrations of the toxic element lead (Pb) are elevated in seawater due to historical emissions. While anthropogenic atmospheric emissions are the dominant source of dissolved Pb (dPb) to the Atlantic Ocean, evidence ... -
Seasonal variations in proton binding characteristics of dissolved organic matter isolated from the southwest baltic sea
Lodeiro, Pablo; Rey Castro, Carlos; David, Calin; Puy Llorens, Jaume; Achterberg, Eric P.; Gledhill, Martha (ACS publications, 2021)The physicochemical characteristics of dissolved organic matter (DOM) strongly influence its interactions with inorganic species such as protons and trace elements in natural waters. We collected water samples at Boknis ... -
Silver nanoparticles coated with natural polysaccharides as models to study AgNP aggregation kinetics using UV-Visible spectrophotometry upon discharge in complex environments
Lodeiro, Pablo; Achterberg, Eric P.; Pampín, Joaquín; Affatati, Alice; El-Shahawi, Mohammad S. (Elsevier, 2016-01-01)This study provides quantitative information on the aggregation and dissolution behaviour of silver nanoparticles (AgNPs) upon discharge in fresh and sea waters, represented here as NaCl solutions of increasing ionic ... -
Solid−Liquid Equilibria in Aqueous Solutions of Tris, Tris-NaCl, Tris- TrisHCl, and Tris-(TrisH)2SO4 at Temperatures from 5 to 45 °C
Lodeiro, Pablo; Turner, David R.; Achterberg, Eric P.; Gregson, Florence K. A.; Reid, Jonathan P.; Clegg, Simon L. (American Chemical Society, 2021-01-14)The substance Tris (or THAM, 2-amino-2-hydroxymethyl-1,3-propanediol) is used in the preparation of pH buffer solutions for applications in natural water chemistry, including seawater. The development of a chemical speciation ... -
The 79°N Glacier cavity modulates subglacial iron export to the NE Greenland Shelf
Krisch, Stephan; Hopwood, Mark J.; Schaffer, Janin; Al-Hashem, Ali; Höfer, Juan; van der Loeff, Michiel M. Rutgers; Conway, Tim M.; Summers, Brent A.; Lodeiro, Pablo; Ardiningsih, Indah; Steffens, Tim; Achterberg, Eric P. (Nature Research, 2021)Approximately half of the freshwater discharged from the Greenland and Antarctic Ice Sheets enters the ocean subsurface as a result of basal ice melt, or runoff draining via the grounding line of a deep ice shelf or ... -
The influence of Arctic Fe and Atlantic fixed N on summertime primary production in Fram Strait, North Greenland Sea
Krisch, Stephan; Browning, Thomas J.; Graeve, Martin; Ludwichowski, Kai-Uwe; Lodeiro, Pablo; Hopwood, Mark J.; Roig, Stéphane; Yong, Jaw-Chuen; Kanzow, Torsten; Achterberg, Eric P. (Springer Nature, 2020-09-17)Climate change has led to a ~ 40% reduction in summer Arctic sea-ice cover extent since the 1970s. Resultant increases in light availability may enhance phytoplankton production. Direct evidence for factors currently ... -
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords
Krause, Jana; Hopwood, Mark J.; Höfer, Juan; Krisch, Stephan; Achterberg, Eric P.; Alarcón, Emilio; Carroll, Dustin; González, Humberto E.; Juul-Pedersen, Thomas; Liu, Te; Lodeiro, Pablo; Meire, Lorenz; Rosing, Minik T. (Frontiers Media, 2021-09-27)Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to the ocean. These plumes contain elevated concentrations of a range of trace metals, ...