Fe-binding ligands, voltammetric methods comparison - PS100 ...

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 (AL) with natural organic ligands. In this study three different ALs were...

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Bibliographic Details
Main Authors: Ardiningsih, Indah, Zu, Kechen, Lodeiro, Pablo, Reichart, Gert-Jan, Achterberg, Eric, Gledhill, Martha, Middag, Rob, Gerringa, Loes
Format: Dataset
Language:unknown
Published: NIOZ 2020
Subjects:
Fram Strait
glacier
Greenland
Nioghalvfjerdsfjorden
Online Access:https://dx.doi.org/10.25850/nioz/7b.b.7
https://dataportal.nioz.nl/doi/10.25850/nioz/7b.b.7
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Summary: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 (AL) with natural organic ligands. In this study three different ALs were used, 2-(2-thiazolylazo)-p-cresol (TAC), salicylaldoxime (SA) and 1-nitroso-2-napthol (NN). The total ligand concentrations ([Lt]) and conditional stability constants (log K??Fe??L) obtained using the different ALs are compared. The comparison was done on seawater samples from Fram Strait and northeast Greenland shelf region, including the Norske Trough, Nioghalvfjerdsfjorden (79N) Glacier front and Westwind Trough. Data interpretation using a one-ligand model resulted in [Lt]SA (2.72 ?? 0.99 nM eq Fe) > [Lt]TAC (1.77 ?? 0.57 nM eq Fe) > [Lt]NN (1.57 ?? 0.58 nM eq Fe); with the mean of log K??Fe??L being the highest for TAC (log K??Fe??L(TAC) = 12.8 ?? 0.5), followed by SA (log K??Fe??L(SA) = 10.9 ?? 0.4) ...

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