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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Photoreduction of terrigenous Fe-humic substances leads to bioavailable iron in oceans
Angewandte Chemie - International Edition, Volume 55, No. 22, Year 2016
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Description
Humic substances (HS) are important iron chelators responsible for the transport of iron from freshwater systems to the open sea, where iron is essential for marine organisms. Evidence suggests that iron complexed to HS comprises the bulk of the iron ligand pool in near-coastal waters and shelf seas. River-derived HS have been investigated to study their transport to, and dwell in oceanic waters. A library of iron model compounds and river-derived Fe-HS samples were probed in a combined X-ray absorption spectroscopy (XAS) and valence-to-core X-ray emission spectroscopy (VtC-XES) study at the Fe K-edge. The analyses performed revealed that iron complexation in HS samples is only dependent on oxygen-containing HS functional groups, such as carboxyl and phenol. The photoreduction mechanism of FeIII-HS in oceanic conditions into bioavailable aquatic FeII forms, highlights the importance of river-derived HS as an iron source for marine organisms. Consequently, such mechanisms are a vital component of the upper-ocean iron biogeochemistry cycle. Let there be light: Terrigenous humic substances (THS) are a major transporter of iron from freshwater systems to coastal and deep waters. Their iron-binding properties are solely dependent on oxygen-containing functional groups. A major iron uptake mechanism by marine organisms in the upper-ocean is governed by photoreduction processes of Fe-THS complexes. © 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
Authors & Co-Authors
Orlowska, Ewelina A.
Austria, Vienna
Universität Wien
Kandioller, Wolfgang
Austria, Vienna
Universität Wien
Jirsa, Franz
Austria, Vienna
Universität Wien
Keppler, Bernhard K.
Austria, Vienna
Universität Wien
Linert, Wolfgang
Austria, Vienna
Technische Universität Wien
Krachler, Rudolf F.
Austria, Vienna
Universität Wien
Krachler, Regina
Austria, Vienna
Universität Wien
Rompel, Annette
Austria, Vienna
Universität Wien
Statistics
Citations: 29
Authors: 8
Affiliations: 2
Identifiers
Doi:
10.1002/anie.201600852
ISSN:
14337851
Research Areas
Environmental