Iron-binding ligands in Dutch estuaries are not affected by UV induced photochemical degradation

This study shows that ultraviolet B (UV-B: 280-315 nm) and UV-A (315-400 nm) have no significant influence on the photodegradation of organic Fe(III)-binding ligands in estuarine waters from Marsdiep and Scheldt (The Netherlands). High salinity estuarine seawater from the Marsdiep and Scheldt contai...

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Bibliographic Details
Published in:Marine Chemistry
Main Authors: Rijkenberg, MJA, Gerringa, LJA, Velzeboer, Ilona, Timmermans, KR, Buma, AGJ, de Baar, HJW
Format: Article in Journal/Newspaper
Language:English
Published: 2006
Subjects:
estuary
UV
organic complexation
Fe(II)
ligand
photochemistry
reduction
iron
DIATOM THALASSIOSIRA-WEISSFLOGII
CATHODIC STRIPPING VOLTAMMETRY
CALIFORNIA UPWELLING REGIME
NATURAL ORGANIC-LIGANDS
COLLOIDAL TRACE-METALS
SOUTHERN-OCEAN
COMPLEXING LIGANDS
SUBNANOMOLAR LEVELS
EQUATORIAL PACIFIC
KINETIC APPROACH
Southern Ocean
Online Access:https://hdl.handle.net/11370/558f326e-fbc6-4989-886a-da1872b5cfbb
https://research.rug.nl/en/publications/558f326e-fbc6-4989-886a-da1872b5cfbb
https://doi.org/10.1016/j.marchem.2005.10.005
Description
Summary:This study shows that ultraviolet B (UV-B: 280-315 nm) and UV-A (315-400 nm) have no significant influence on the photodegradation of organic Fe(III)-binding ligands in estuarine waters from Marsdiep and Scheldt (The Netherlands). High salinity estuarine seawater from the Marsdiep and Scheldt contains concentrations of organic Fe(Ill)-binding ligands as high as 24.4 equivalent of nM Fe (eq nM Fe) and similar to 4.6 eq nM Fe, respectively, with conditional stability constants (K) of 10(21.0) and 10(20.1), respectively. Investigation of the relation between the organically bound iron fraction and the photoproduction of Fe(II) in the estuarine Marsdiep and Scheldt water shows that the concentration of Fe(II) produced was very low (<240 pM). This demonstrates that the major part of the organically complexed Fe(III) is not involved in photoinduced Fe redox cycling. Consequently UV has no influence on the transport of dissolved organically complexed Fe(III) from the estuarine environment to the coastal zone. (c) 2005 Elsevier B.V. All rights reserved.

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